* Fixed some ability and subtype removing effects (fixes #1352).

Mage.Sets/src/mage/sets/futuresight/MagusOfTheMoon.java

@@ -34,6 +34,7 @@ import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.ContinuousEffectImpl;
 import mage.abilities.mana.RedManaAbility;
 import mage.cards.CardImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.DependencyType;
 import mage.constants.Duration;
@@ -108,14 +109,16 @@ public class MagusOfTheMoon extends CardImpl {
         public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
             for (Permanent land : game.getBattlefield().getActivePermanents(filter, source.getControllerId(), game)) {
                 switch (layer) {
-                    case AbilityAddingRemovingEffects_6:
-                        land.removeAllAbilities(source.getSourceId(), game);
-                        land.addAbility(new RedManaAbility(), source.getSourceId(), game);
-                        break;
                     case TypeChangingEffects_4:
-                        land.getSubtype().clear();
+                        // 305.7 Note that this doesn't remove any abilities that were granted to the land by other effects
+                        // So the ability removing has to be done before Layer 6
+                        land.removeAllAbilities(source.getSourceId(), game);
+                        land.getSubtype().removeAll(CardRepository.instance.getLandTypes());
                         land.getSubtype().add("Mountain");
                         break;
+                    case AbilityAddingRemovingEffects_6:
+                        land.addAbility(new RedManaAbility(), source.getSourceId(), game);
+                        break;
                 }
             }
             return true;

Mage.Sets/src/mage/sets/ninthedition/BloodMoon.java

@@ -28,6 +28,12 @@
 package mage.sets.ninthedition;
 
 import java.util.UUID;
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.abilities.mana.RedManaAbility;
+import mage.cards.CardImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
@@ -35,11 +41,6 @@ import mage.constants.Outcome;
 import mage.constants.Rarity;
 import mage.constants.SubLayer;
 import mage.constants.Zone;
-import mage.abilities.Ability;
-import mage.abilities.common.SimpleStaticAbility;
-import mage.abilities.effects.ContinuousEffectImpl;
-import mage.abilities.mana.RedManaAbility;
-import mage.cards.CardImpl;
 import mage.filter.common.FilterLandPermanent;
 import mage.filter.predicate.Predicates;
 import mage.filter.predicate.mageobject.SupertypePredicate;
@@ -56,7 +57,6 @@ public class BloodMoon extends CardImpl {
         super(ownerId, 176, "Blood Moon", Rarity.RARE, new CardType[]{CardType.ENCHANTMENT}, "{2}{R}");
         this.expansionSetCode = "9ED";
 
-
         // Nonbasic lands are Mountains.
         this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new BloodMoonEffect()));
     }
@@ -74,6 +74,7 @@ public class BloodMoon extends CardImpl {
 class BloodMoonEffect extends ContinuousEffectImpl {
 
     private static final FilterLandPermanent filter = new FilterLandPermanent();
+
     static {
         filter.add(Predicates.not(new SupertypePredicate("Basic")));
     }
@@ -101,14 +102,16 @@ class BloodMoonEffect extends ContinuousEffectImpl {
     public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
         for (Permanent land : game.getBattlefield().getActivePermanents(filter, source.getControllerId(), game)) {
             switch (layer) {
-                case AbilityAddingRemovingEffects_6:
-                    land.removeAllAbilities(source.getSourceId(), game);
-                    land.addAbility(new RedManaAbility(), source.getSourceId(), game);
-                    break;
                 case TypeChangingEffects_4:
-                    land.getSubtype().clear();
+                    // 305.7 Note that this doesn't remove any abilities that were granted to the land by other effects
+                    // So the ability removing has to be done before Layer 6
+                    land.removeAllAbilities(source.getSourceId(), game);
+                    land.getSubtype().removeAll(CardRepository.instance.getLandTypes());
                     land.getSubtype().add("Mountain");
                     break;
+                case AbilityAddingRemovingEffects_6:
+                    land.addAbility(new RedManaAbility(), source.getSourceId(), game);
+                    break;
             }
         }
         return true;

Mage.Sets/src/mage/sets/returntoravnica/ChromaticLantern.java

@@ -28,14 +28,13 @@
 package mage.sets.returntoravnica;
 
 import java.util.UUID;
-
-import mage.constants.CardType;
-import mage.constants.Rarity;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.common.continuous.GainAbilityControlledEffect;
 import mage.abilities.mana.AnyColorManaAbility;
 import mage.cards.CardImpl;
+import mage.constants.CardType;
 import mage.constants.Duration;
+import mage.constants.Rarity;
 import mage.constants.Zone;
 import mage.filter.common.FilterLandPermanent;
 
@@ -51,7 +50,6 @@ public class ChromaticLantern extends CardImpl {
         // Lands you control have "{T}: Add one mana of any color to your mana pool."
         this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new GainAbilityControlledEffect(new AnyColorManaAbility(), Duration.WhileOnBattlefield, new FilterLandPermanent("Lands"), false)));
 
-
         // {T}: Add one mana of any color to your mana pool.
         this.addAbility(new AnyColorManaAbility());
 
@@ -66,4 +64,3 @@ public class ChromaticLantern extends CardImpl {
         return new ChromaticLantern(this);
     }
 }
-

Mage.Sets/src/mage/sets/torment/ChainerDementiaMaster.java

@@ -43,7 +43,7 @@ import mage.abilities.effects.OneShotEffect;
 import mage.abilities.effects.common.ExileAllEffect;
 import mage.abilities.effects.common.ReturnFromGraveyardToBattlefieldTargetEffect;
 import mage.abilities.effects.common.continuous.BecomesColorTargetEffect;
-import mage.abilities.effects.common.continuous.BecomesSubtypeTargetEffect;
+import mage.abilities.effects.common.continuous.BecomesCreatureTypeTargetEffect;
 import mage.abilities.effects.common.continuous.BoostAllEffect;
 import mage.cards.CardImpl;
 import mage.constants.CardType;
@@ -133,7 +133,7 @@ class ChainerDementiaMasterEffect extends OneShotEffect {
                 ContinuousEffectImpl effect = new BecomesColorTargetEffect(ObjectColor.BLACK, Duration.WhileOnBattlefield);
                 effect.setTargetPointer(new FixedTarget(permanent, game));
                 game.addEffect(effect, source);
-                effect = new BecomesSubtypeTargetEffect(Duration.WhileOnBattlefield, new ArrayList<>(Arrays.asList("Nightmare")), false);
+                effect = new BecomesCreatureTypeTargetEffect(Duration.WhileOnBattlefield, new ArrayList<>(Arrays.asList("Nightmare")), false);
                 effect.setTargetPointer(new FixedTarget(permanent, game));
                 game.addEffect(effect, source);
             }

Mage.Tests/src/test/java/org/mage/test/cards/continuous/LandTypeChangingEffects.java

@@ -0,0 +1,100 @@
+/*
+ *  Copyright 2010 BetaSteward_at_googlemail.com. All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above copyright notice, this list of
+ *        conditions and the following disclaimer.
+ *
+ *     2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *        of conditions and the following disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of BetaSteward_at_googlemail.com.
+ */
+package org.mage.test.cards.continuous;
+
+import mage.abilities.mana.AnyColorManaAbility;
+import mage.constants.CardType;
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ *
+ * @author LevelX2
+ */
+public class LandTypeChangingEffects extends CardTestPlayerBase {
+
+    /**
+     *
+     * Playing a commander game. Opponent had a Magus of the Moon, and I later
+     * dropped a Chromatic Lantern.
+     *
+     * I was not allowed to use the Chromatic Lantern's ability. Since layers
+     * are tricky I asked on the Judge's chat to confirm and the user "luma"
+     * said it should work on this scenario.
+     *
+     */
+    @Test
+    public void testMagusOfTheMoonAndChromaticLantern() {
+        // Nonbasic lands are Mountains.
+        addCard(Zone.BATTLEFIELD, playerA, "Magus of the Moon");
+
+        addCard(Zone.BATTLEFIELD, playerB, "Canopy Vista", 1);
+        addCard(Zone.BATTLEFIELD, playerB, "Plains", 2);
+        // Lands you control have "{T}: Add one mana of any color to your mana pool."
+        // {T}: Add one mana of any color to your mana pool.
+        addCard(Zone.HAND, playerB, "Chromatic Lantern");
+
+        castSpell(2, PhaseStep.PRECOMBAT_MAIN, playerB, "Chromatic Lantern");
+
+        setStopAt(2, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerB, "Chromatic Lantern", 1);
+
+        assertType("Canopy Vista", CardType.LAND, "Mountain");
+        assertAbility(playerB, "Canopy Vista", new AnyColorManaAbility(), true);
+    }
+
+    @Test
+    public void testChromaticLanternBeforeMagusOfTheMoon() {
+        // Nonbasic lands are Mountains.
+        addCard(Zone.HAND, playerA, "Magus of the Moon");// {2}{R}
+        addCard(Zone.BATTLEFIELD, playerA, "Mountain", 3);
+
+        addCard(Zone.BATTLEFIELD, playerB, "Canopy Vista", 1);
+        addCard(Zone.BATTLEFIELD, playerB, "Plains", 2);
+        // Lands you control have "{T}: Add one mana of any color to your mana pool."
+        // {T}: Add one mana of any color to your mana pool.
+        addCard(Zone.HAND, playerB, "Chromatic Lantern");
+
+        castSpell(2, PhaseStep.PRECOMBAT_MAIN, playerB, "Chromatic Lantern");
+
+        castSpell(3, PhaseStep.PRECOMBAT_MAIN, playerA, "Magus of the Moon");
+        setStopAt(3, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerB, "Chromatic Lantern", 1);
+        assertPermanentCount(playerA, "Magus of the Moon", 1);
+
+        assertType("Canopy Vista", CardType.LAND, "Mountain");
+        assertAbility(playerB, "Canopy Vista", new AnyColorManaAbility(), true);
+    }
+
+}

Mage/src/mage/abilities/effects/common/ChooseBasicLandTypeEffect.java

@@ -8,6 +8,7 @@ package mage.abilities.effects.common;
 import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.effects.OneShotEffect;
+import mage.choices.ChoiceBasicLandType;
 import mage.choices.ChoiceImpl;
 import mage.constants.Outcome;
 import mage.game.Game;
@@ -45,14 +46,7 @@ public class ChooseBasicLandTypeEffect extends OneShotEffect {
             mageObject = game.getObject(source.getSourceId());
         }
         if (controller != null && mageObject != null) {
-            ChoiceImpl choices = new ChoiceImpl(true);
+            ChoiceImpl choices = new ChoiceBasicLandType();
-            choices.setMessage("Choose basic land type");
-            choices.isRequired();
-            choices.getChoices().add("Forest");
-            choices.getChoices().add("Plains");
-            choices.getChoices().add("Mountain");
-            choices.getChoices().add("Island");
-            choices.getChoices().add("Swamp");
             if (controller.choose(Outcome.Neutral, choices, game)) {
                 game.informPlayers(mageObject.getName() + ":  Chosen basic land type is " + choices.getChoice());
                 game.getState().setValue(mageObject.getId().toString() + VALUE_KEY, choices.getChoice());

Mage/src/mage/abilities/effects/common/continuous/BecomesBasicLandTargetEffect.java

@@ -37,6 +37,7 @@ import mage.abilities.mana.BlueManaAbility;
 import mage.abilities.mana.GreenManaAbility;
 import mage.abilities.mana.RedManaAbility;
 import mage.abilities.mana.WhiteManaAbility;
+import mage.cards.repository.CardRepository;
 import mage.choices.Choice;
 import mage.choices.ChoiceBasicLandType;
 import mage.constants.CardType;
@@ -147,8 +148,19 @@ public class BecomesBasicLandTargetEffect extends ContinuousEffectImpl {
             Permanent land = game.getPermanent(targetPermanent);
             if (land != null) {
                 switch (layer) {
-                    case AbilityAddingRemovingEffects_6:
+                    case TypeChangingEffects_4:
+                        // Attention: Cards like Unstable Frontier that use this class do not give the "Basic" supertype to the target
+                        if (!land.getCardType().contains(CardType.LAND)) {
+                            land.getCardType().add(CardType.LAND);
+                        }
+                        // 305.7 Note that this doesn't remove any abilities that were granted to the land by other effects
+                        // So the ability removing has to be done before Layer 6
                         land.removeAllAbilities(source.getSourceId(), game);
+                        // 305.7
+                        land.getSubtype().removeAll(CardRepository.instance.getLandTypes());
+                        land.getSubtype().addAll(landTypes);
+                        break;
+                    case AbilityAddingRemovingEffects_6:
                         for (String landType : landTypes) {
                             switch (landType) {
                                 case "Swamp":
@@ -169,14 +181,6 @@ public class BecomesBasicLandTargetEffect extends ContinuousEffectImpl {
                             }
                         }
                         break;
-                    case TypeChangingEffects_4:
-                        // Attention: Cards like Unstable Frontier that use this class do not give the "Basic" supertype to the target
-                        if (!land.getCardType().contains(CardType.LAND)) {
-                            land.getCardType().add(CardType.LAND);
-                        }
-                        land.getSubtype().clear();
-                        land.getSubtype().addAll(landTypes);
-                        break;
                 }
             }
         }

Mage/src/mage/abilities/effects/common/continuous/BecomesChosenCreatureTypeTargetEffect.java

@@ -67,7 +67,7 @@ public class BecomesChosenCreatureTypeTargetEffect extends OneShotEffect {
             chosenType = typeChoice.getChoice();
             if (chosenType != null && !chosenType.isEmpty()) {
                 // ADD TYPE TO TARGET
-                ContinuousEffect effect = new BecomesSubtypeTargetEffect(Duration.EndOfTurn, chosenType);
+                ContinuousEffect effect = new BecomesCreatureTypeTargetEffect(Duration.EndOfTurn, chosenType);
                 effect.setTargetPointer(new FixedTarget(getTargetPointer().getFirst(game, source)));
                 game.addEffect(effect, source);
                 return true;

Mage/src/mage/abilities/effects/common/continuous/BecomesCreatureAllEffect.java

@@ -27,14 +27,14 @@
  */
 package mage.abilities.effects.common.continuous;
 
+import mage.abilities.Ability;
+import mage.abilities.Mode;
+import mage.abilities.effects.ContinuousEffectImpl;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
 import mage.constants.Outcome;
 import mage.constants.SubLayer;
-import mage.abilities.Ability;
-import mage.abilities.Mode;
-import mage.abilities.effects.ContinuousEffectImpl;
 import mage.filter.FilterPermanent;
 import mage.game.Game;
 import mage.game.permanent.Permanent;
@@ -48,7 +48,7 @@ public class BecomesCreatureAllEffect extends ContinuousEffectImpl {
 
     protected Token token;
     protected String type;
-    private FilterPermanent filter;
+    private final FilterPermanent filter;
 
     public BecomesCreatureAllEffect(Token token, String type, FilterPermanent filter, Duration duration) {
         super(duration, Outcome.BecomeCreature);
@@ -93,9 +93,10 @@ public class BecomesCreatureAllEffect extends ContinuousEffectImpl {
                         break;
                     case ColorChangingEffects_5:
                         if (sublayer == SubLayer.NA) {
-                            if (token.getColor(game).hasColor())
+                            if (token.getColor(game).hasColor()) {
                                 permanent.getColor(game).setColor(token.getColor(game));
                             }
+                        }
                         break;
                     case AbilityAddingRemovingEffects_6:
                         if (sublayer == SubLayer.NA) {

Mage/src/mage/abilities/effects/common/continuous/BecomesCreatureAttachedEffect.java

@@ -29,6 +29,7 @@ package mage.abilities.effects.common.continuous;
 
 import mage.abilities.Ability;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
@@ -110,7 +111,7 @@ public class BecomesCreatureAttachedEffect extends ContinuousEffectImpl {
                             switch (loseType) {
                                 case ALL:
                                 case ALL_BUT_COLOR:
-                                    permanent.getSubtype().clear();
+                                    permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                                     break;
                             }
                             if (token.getSubtype().size() > 0) {

Mage/src/mage/abilities/effects/common/continuous/BecomesCreatureSourceEffect.java

@@ -25,13 +25,13 @@
  *  authors and should not be interpreted as representing official policies, either expressed
  *  or implied, of BetaSteward_at_googlemail.com.
  */
-
 package mage.abilities.effects.common.continuous;
 
 import mage.MageInt;
 import mage.MageObjectReference;
 import mage.abilities.Ability;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
@@ -106,7 +106,7 @@ public class BecomesCreatureSourceEffect extends ContinuousEffectImpl implements
                             }
                         }
                         if ("".equals(type) || type == null) {
-                            permanent.getSubtype().clear();
+                            permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                         }
                         if (token.getSubtype().size() > 0) {
                             permanent.getSubtype().addAll(token.getSubtype());
@@ -156,8 +156,7 @@ public class BecomesCreatureSourceEffect extends ContinuousEffectImpl implements
     private void setText() {
         if (type != null && type.length() > 0) {
             staticText = duration.toString() + " {this} becomes a " + token.getDescription() + " that's still a " + this.type;
-        }
+        } else {
-        else {
             staticText = duration.toString() + " {this} becomes a " + token.getDescription();
         }
     }

Mage/src/mage/abilities/effects/common/continuous/BecomesCreatureTargetEffect.java

@@ -28,14 +28,15 @@
 package mage.abilities.effects.common.continuous;
 
 import java.util.UUID;
+import mage.abilities.Ability;
+import mage.abilities.Mode;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
 import mage.constants.Outcome;
 import mage.constants.SubLayer;
-import mage.abilities.Ability;
-import mage.abilities.Mode;
-import mage.abilities.effects.ContinuousEffectImpl;
 import mage.game.Game;
 import mage.game.permanent.Permanent;
 import mage.game.permanent.token.Token;
@@ -87,7 +88,7 @@ public class BecomesCreatureTargetEffect extends ContinuousEffectImpl {
                     case TypeChangingEffects_4:
                         if (sublayer == SubLayer.NA) {
                             if (loseAllAbilities) {
-                                permanent.getSubtype().clear();
+                                permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                                 permanent.getSubtype().addAll(token.getSubtype());
                             } else {
                                 if (token.getSubtype().size() > 0) {

Mage/src/mage/abilities/effects/common/continuous/BecomesCreatureTypeTargetEffect.java

@@ -9,6 +9,7 @@ import java.util.ArrayList;
 import java.util.UUID;
 import mage.abilities.Ability;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.Duration;
 import mage.constants.Layer;
 import static mage.constants.Layer.TypeChangingEffects_4;
@@ -21,20 +22,20 @@ import mage.game.permanent.Permanent;
  *
  * @author LevelX2
  */
-public class BecomesSubtypeTargetEffect extends ContinuousEffectImpl {
+public class BecomesCreatureTypeTargetEffect extends ContinuousEffectImpl {
 
     protected ArrayList<String> subtypes = new ArrayList();
-    protected boolean loseOther;  // loses other subtypes
+    protected boolean loseOther;  // loses other creature types
 
-    public BecomesSubtypeTargetEffect(Duration duration, String subtype) {
+    public BecomesCreatureTypeTargetEffect(Duration duration, String subtype) {
         this(duration, createArrayList(subtype));
     }
 
-    public BecomesSubtypeTargetEffect(Duration duration, ArrayList<String> subtypes) {
+    public BecomesCreatureTypeTargetEffect(Duration duration, ArrayList<String> subtypes) {
         this(duration, subtypes, true);
     }
 
-    public BecomesSubtypeTargetEffect(Duration duration, ArrayList<String> subtypes, boolean loseOther) {
+    public BecomesCreatureTypeTargetEffect(Duration duration, ArrayList<String> subtypes, boolean loseOther) {
         super(duration, Outcome.Detriment);
         this.subtypes = subtypes;
         this.staticText = setText();
@@ -47,7 +48,7 @@ public class BecomesSubtypeTargetEffect extends ContinuousEffectImpl {
         return subtypes;
     }
 
-    public BecomesSubtypeTargetEffect(final BecomesSubtypeTargetEffect effect) {
+    public BecomesCreatureTypeTargetEffect(final BecomesCreatureTypeTargetEffect effect) {
         super(effect);
         this.subtypes.addAll(effect.subtypes);
         this.loseOther = effect.loseOther;
@@ -60,8 +61,8 @@ public class BecomesSubtypeTargetEffect extends ContinuousEffectImpl {
     }
 
     @Override
-    public BecomesSubtypeTargetEffect copy() {
+    public BecomesCreatureTypeTargetEffect copy() {
-        return new BecomesSubtypeTargetEffect(this);
+        return new BecomesCreatureTypeTargetEffect(this);
     }
 
     @Override
@@ -72,7 +73,7 @@ public class BecomesSubtypeTargetEffect extends ContinuousEffectImpl {
                 switch (layer) {
                     case TypeChangingEffects_4:
                         if (loseOther) {
-                            permanent.getSubtype().clear();
+                            permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                             permanent.getSubtype().addAll(subtypes);
                         } else {
                             for (String subtype : subtypes) {

Mage/src/mage/abilities/effects/common/continuous/BecomesSubtypeAllEffect.java

@@ -6,12 +6,9 @@
 package mage.abilities.effects.common.continuous;
 
 import java.util.ArrayList;
-import java.util.Iterator;
-
-import mage.MageObjectReference;
 import mage.abilities.Ability;
-import mage.abilities.dynamicvalue.common.StaticValue;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.Duration;
 import mage.constants.Layer;
 import mage.constants.Outcome;
@@ -78,7 +75,7 @@ public class BecomesSubtypeAllEffect extends ContinuousEffectImpl {
                 switch (layer) {
                     case TypeChangingEffects_4:
                         if (loseOther) {
-						permanent.getSubtype().clear();
+                            permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                             permanent.getSubtype().addAll(subtypes);
                         } else {
                             for (String subtype : subtypes) {

Mage/src/mage/abilities/effects/common/continuous/LoseAllCreatureTypesTargetEffect.java

@@ -30,6 +30,7 @@ package mage.abilities.effects.common.continuous;
 import mage.abilities.Ability;
 import mage.abilities.Mode;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.Duration;
 import mage.constants.Layer;
 import mage.constants.Outcome;
@@ -60,8 +61,7 @@ public class LoseAllCreatureTypesTargetEffect extends ContinuousEffectImpl {
     public boolean apply(Game game, Ability source) {
         Permanent permanent = game.getPermanent(getTargetPointer().getFirst(game, source));
         if (permanent != null) {
-            permanent.getSubtype().clear();
+            return permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
-            return true;
         }
         return false;
     }

Mage/src/mage/abilities/effects/common/continuous/LoseCreatureTypeSourceEffect.java

@@ -30,6 +30,7 @@ package mage.abilities.effects.common.continuous;
 import mage.abilities.Ability;
 import mage.abilities.dynamicvalue.DynamicValue;
 import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Layer;
@@ -50,7 +51,8 @@ public class LoseCreatureTypeSourceEffect extends ContinuousEffectImpl implement
     private final int lessThan;
 
     /**
-     * Permanent loses the creature type as long as the dynamic value is less than the value of lessThan.
+     * Permanent loses the creature type as long as the dynamic value is less
+     * than the value of lessThan.
      *
      * @param dynamicValue
      * @param lessThan
@@ -84,7 +86,7 @@ public class LoseCreatureTypeSourceEffect extends ContinuousEffectImpl implement
                 case TypeChangingEffects_4:
                     if (sublayer == SubLayer.NA) {
                         permanent.getCardType().remove(CardType.CREATURE);
-                        permanent.getSubtype().clear();
+                        permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                         if (permanent.isAttacking() || permanent.getBlocking() > 0) {
                             permanent.removeFromCombat(game);
                         }

Mage/src/mage/abilities/effects/common/continuous/SetCardSubtypeAttachedEffect.java

@@ -29,10 +29,14 @@ package mage.abilities.effects.common.continuous;
 
 import java.util.ArrayList;
 import java.util.List;
-
 import mage.abilities.Ability;
 import mage.abilities.effects.ContinuousEffectImpl;
-import mage.constants.*;
+import mage.cards.repository.CardRepository;
+import mage.constants.AttachmentType;
+import mage.constants.Duration;
+import mage.constants.Layer;
+import mage.constants.Outcome;
+import mage.constants.SubLayer;
 import mage.game.Game;
 import mage.game.permanent.Permanent;
 
@@ -70,7 +74,7 @@ public class SetCardSubtypeAttachedEffect extends ContinuousEffectImpl {
         if (equipment != null && equipment.getAttachedTo() != null) {
             Permanent target = game.getPermanent(equipment.getAttachedTo());
             if (target != null) {
-                target.getSubtype().clear();
+                target.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                 target.getSubtype().addAll(setSubtypes);
             }
         }

Mage/src/mage/abilities/keyword/BestowAbility.java

@@ -35,6 +35,7 @@ import mage.abilities.effects.ContinuousEffectImpl;
 import mage.abilities.effects.common.AttachEffect;
 import mage.abilities.effects.common.continuous.SourceEffect;
 import mage.cards.Card;
+import mage.cards.repository.CardRepository;
 import mage.constants.CardType;
 import mage.constants.DependencyType;
 import mage.constants.Duration;
@@ -181,7 +182,7 @@ public class BestowAbility extends SpellAbility {
                                 }
                             } else {
                                 permanent.getCardType().remove(CardType.CREATURE);
-                                permanent.getSubtype().clear();
+                                permanent.getSubtype().retainAll(CardRepository.instance.getLandTypes());
                                 if (!permanent.getSubtype().contains("Aura")) {
                                     permanent.getSubtype().add("Aura");
                                 }

Mage/src/mage/cards/repository/CardRepository.java

@@ -69,6 +69,8 @@ public enum CardRepository {
     private Dao<CardInfo, Object> cardDao;
     private Set<String> classNames;
 
+    private final TreeSet<String> landTypes = new TreeSet();
+
     private CardRepository() {
         File file = new File("db");
         if (!file.exists()) {
@@ -85,7 +87,7 @@ public enum CardRepository {
             TableUtils.createTableIfNotExists(connectionSource, CardInfo.class);
             cardDao = DaoManager.createDao(connectionSource, CardInfo.class);
         } catch (SQLException ex) {
-            ex.printStackTrace();
+            Logger.getLogger(CardRepository.class).error("Error creating card repository - ", ex);
         }
     }
 
@@ -102,7 +104,7 @@ public enum CardRepository {
                             }
                         }
                     } catch (SQLException ex) {
-                        Logger.getLogger(CardRepository.class).error("Error adding cards to DB: " + ex.getCause());
+                        Logger.getLogger(CardRepository.class).error("Error adding cards to DB - ", ex);
                     }
                     return null;
                 }
@@ -252,21 +254,22 @@ public enum CardRepository {
     }
 
     public Set<String> getLandTypes() {
-        TreeSet<String> subtypes = new TreeSet<>();
+        if (landTypes.isEmpty()) {
             try {
                 QueryBuilder<CardInfo, Object> qb = cardDao.queryBuilder();
                 qb.distinct().selectColumns("subtypes");
                 qb.where().like("types", new SelectArg('%' + CardType.LAND.name() + '%'));
                 List<CardInfo> results = cardDao.query(qb.prepare());
                 for (CardInfo card : results) {
-                subtypes.addAll(card.getSubTypes());
+                    landTypes.addAll(card.getSubTypes());
                 }
                 // Removing Dryad because of Dryad Arbor
-            subtypes.remove("Dryad");
+                landTypes.remove("Dryad");
 
             } catch (SQLException ex) {
             }
-        return subtypes;
+        }
+        return landTypes;
     }
 
     public CardInfo findCard(String setCode, int cardNumber) {
@@ -391,7 +394,7 @@ public enum CardRepository {
             ConnectionSource connectionSource = new JdbcConnectionSource(JDBC_URL);
             return RepositoryUtil.getDatabaseVersion(connectionSource, VERSION_ENTITY_NAME + "Content");
         } catch (SQLException ex) {
-            ex.printStackTrace();
+            Logger.getLogger(CardRepository.class).error("Error getting content version from DB - ", ex);
         }
         return 0;
     }
@@ -401,7 +404,7 @@ public enum CardRepository {
             ConnectionSource connectionSource = new JdbcConnectionSource(JDBC_URL);
             RepositoryUtil.updateVersion(connectionSource, VERSION_ENTITY_NAME + "Content", version);
         } catch (SQLException ex) {
-            ex.printStackTrace();
+            Logger.getLogger(CardRepository.class).error("Error getting content version - ", ex);
         }
     }