-don't static import static filters

-use existing choose color and gain protection from color attached effects
-update naming and add null check for AttachedToCreatureSourceTriggeredAbility

Mage.Sets/src/mage/cards/s/SanctuaryBlade.java

@@ -1,15 +1,19 @@
 package mage.cards.s;
 
-import mage.abilities.common.AttachedToCreatureTriggeredAbility;
+import mage.abilities.common.AttachedToCreatureSourceTriggeredAbility;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.costs.mana.GenericManaCost;
 import mage.abilities.effects.Effect;
+import mage.abilities.effects.common.ChooseColorEffect;
 import mage.abilities.effects.common.continuous.BoostEquippedEffect;
-import mage.abilities.effects.common.continuous.GainProtectionFromColorAttachedEffect;
+import mage.abilities.effects.keyword.ProtectionChosenColorAttachedEffect;
 import mage.abilities.keyword.EquipAbility;
 import mage.cards.CardImpl;
 import mage.cards.CardSetInfo;
-import mage.constants.*;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.constants.Zone;
 
 import java.util.UUID;
 
@@ -25,13 +29,15 @@ public final class SanctuaryBlade extends CardImpl {
         this.subtype.add(SubType.EQUIPMENT);
 
         // As Sanctuary Blade becomes attached to a creature, choose a color.
-        GainProtectionFromColorAttachedEffect protectionEffect = new GainProtectionFromColorAttachedEffect(Duration.WhileOnBattlefield);
-        this.addAbility(new AttachedToCreatureTriggeredAbility(protectionEffect, false));
+        this.addAbility(new AttachedToCreatureSourceTriggeredAbility(new ChooseColorEffect(Outcome.Benefit), false));
 
-        // Equipped creature gets +2/+0 and has protection from the last chosen color.
+        // Equipped creature gets +2/+0
         Effect boostEffect = new BoostEquippedEffect(2, 0);
         this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, boostEffect));
 
+        // and has protection from the last chosen color
+        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ProtectionChosenColorAttachedEffect(false)));
+
         // Equip {3}
         this.addAbility(new EquipAbility(Outcome.BoostCreature, new GenericManaCost(3)));
     }

Mage.Sets/src/mage/cards/v/VergeRangers.java

@@ -11,14 +11,12 @@ import mage.cards.CardSetInfo;
 import mage.constants.CardType;
 import mage.constants.SubType;
 import mage.constants.Zone;
+import mage.filter.StaticFilters;
 import mage.game.Game;
 
 import java.util.Comparator;
 import java.util.UUID;
 
-import static mage.filter.StaticFilters.FILTER_CARD_LAND;
-import static mage.filter.StaticFilters.FILTER_LAND;
-
 /**
  *
  * @author htrajan
@@ -56,7 +54,7 @@ public final class VergeRangers extends CardImpl {
 class VergeRangersEffect extends PlayTheTopCardEffect {
 
     public VergeRangersEffect() {
-        super(FILTER_CARD_LAND);
+        super(StaticFilters.FILTER_CARD_LAND);
         staticText = "As long as an opponent controls more lands than you, you may play lands from the top of your library.";
     }
 
@@ -72,9 +70,9 @@ class VergeRangersEffect extends PlayTheTopCardEffect {
     @Override
     public boolean applies(UUID objectId, Ability affectedAbility, Ability source, Game game, UUID playerId) {
         if (super.applies(objectId, affectedAbility, source, game, playerId)) {
-            int myLandCount = game.getBattlefield().countAll(FILTER_LAND, playerId, game);
+            int myLandCount = game.getBattlefield().countAll(StaticFilters.FILTER_LAND, playerId, game);
             int maxOpponentLandCount = game.getOpponents(playerId).stream()
-                    .map(opponentId -> game.getBattlefield().countAll(FILTER_LAND, opponentId, game))
+                    .map(opponentId -> game.getBattlefield().countAll(StaticFilters.FILTER_LAND, opponentId, game))
                     .max(Comparator.naturalOrder())
                     .orElse(0);
             return maxOpponentLandCount > myLandCount;

Mage.Tests/src/test/java/org/mage/test/cards/single/c20/SanctuaryBladeTest.java

@@ -24,7 +24,7 @@ public class SanctuaryBladeTest extends CardTestPlayerBase {
         assertAllCommandsUsed();
 
         assertPowerToughness(playerA, "Savai Sabertooth", 5, 1);
-        assertAbility(playerA, "Savai Sabertooth", new ProtectionAbility(new FilterCard("Black")), true);
+        assertAbility(playerA, "Savai Sabertooth", new ProtectionAbility(new FilterCard("black")), true);
     }
 
 }

Mage/src/main/java/mage/abilities/common/AttachedToCreatureSourceTriggeredAbility.java

@@ -13,19 +13,21 @@ import static mage.constants.CardType.CREATURE;
  *
  * @author htrajan
  */
-public class AttachedToCreatureTriggeredAbility extends TriggeredAbilityImpl {
+public class AttachedToCreatureSourceTriggeredAbility extends TriggeredAbilityImpl {
 
-    public AttachedToCreatureTriggeredAbility(Effect effect, boolean optional) {
+    public AttachedToCreatureSourceTriggeredAbility(Effect effect, boolean optional) {
         super(Zone.BATTLEFIELD, effect, optional);
     }
 
-    public AttachedToCreatureTriggeredAbility(final AttachedToCreatureTriggeredAbility ability) {
+    public AttachedToCreatureSourceTriggeredAbility(final AttachedToCreatureSourceTriggeredAbility ability) {
         super(ability);
     }
 
     @Override
     public boolean checkEventType(GameEvent event, Game game) {
-        return event.getType() == GameEvent.EventType.ATTACHED && event.getSourceId().equals(this.getSourceId());
+        return event.getType() == GameEvent.EventType.ATTACHED
+                && event.getSourceId() != null
+                && event.getSourceId().equals(this.getSourceId());
     }
 
     @Override
@@ -40,7 +42,7 @@ public class AttachedToCreatureTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public AttachedToCreatureTriggeredAbility copy() {
-        return new AttachedToCreatureTriggeredAbility(this);
+    public AttachedToCreatureSourceTriggeredAbility copy() {
+        return new AttachedToCreatureSourceTriggeredAbility(this);
     }
 }

Mage/src/main/java/mage/abilities/effects/common/continuous/GainProtectionFromColorAttachedEffect.java

@@ -1,67 +0,0 @@
-
-package mage.abilities.effects.common.continuous;
-
-import mage.abilities.Ability;
-import mage.abilities.keyword.ProtectionAbility;
-import mage.choices.ChoiceColor;
-import mage.constants.Duration;
-import mage.filter.FilterCard;
-import mage.filter.predicate.mageobject.ColorPredicate;
-import mage.game.Game;
-import mage.game.permanent.Permanent;
-import mage.players.Player;
-
-/**
- *
- * @author htrajan
- */
-public class GainProtectionFromColorAttachedEffect extends GainAbilitySourceEffect {
-
-    FilterCard protectionFilter;
-
-    public GainProtectionFromColorAttachedEffect(Duration duration) {
-        super(new ProtectionAbility(new FilterCard()), duration);
-        protectionFilter = (FilterCard) ((ProtectionAbility) ability).getFilter();
-    }
-
-    public GainProtectionFromColorAttachedEffect(final GainProtectionFromColorAttachedEffect effect) {
-        super(effect);
-        this.protectionFilter = effect.protectionFilter.copy();
-    }
-
-    @Override
-    public GainProtectionFromColorAttachedEffect copy() {
-        return new GainProtectionFromColorAttachedEffect(this);
-    }
-
-    @Override
-    public void init(Ability source, Game game) {
-        super.init(source, game);
-        Player controller = game.getPlayer(source.getControllerId());
-        if (controller != null) {
-            ChoiceColor colorChoice = new ChoiceColor(true);
-            colorChoice.setMessage("Choose color for protection ability");
-            if (controller.choose(outcome, colorChoice, game)) {
-                game.informPlayers("Choosen color: " + colorChoice.getColor());
-                protectionFilter.add(new ColorPredicate(colorChoice.getColor()));
-                protectionFilter.setMessage(colorChoice.getChoice());
-                ((ProtectionAbility) ability).setFilter(protectionFilter);
-                return;
-            }
-        }
-        discard();
-    }
-
-    @Override
-    public boolean apply(Game game, Ability source) {
-        Permanent permanent = game.getPermanent(source.getSourceId());
-        if (permanent != null && permanent.getAttachedTo() != null) {
-            Permanent attachedPermanent = game.getPermanent(permanent.getAttachedTo());
-            attachedPermanent.addAbility(ability, source.getSourceId(), game);
-        } else {
-            // the source permanent is no longer on the battlefield, or it is not attached -- effect can be discarded
-            discard();
-        }
-        return true;
-    }
-}