LoseAllAbilitiesTargetEffect. Updated BecomesCreatureSourceEffect and BecomesCreatureTargetEffect to clear previous subtypes if needed.

Mage/src/mage/Constants.java

@@ -303,6 +303,7 @@ public final class Constants {
 		BoostCreature(true),
 		UnboostCreature(false),
 		AddAbility(true),
+		LoseAbility(false),
 		GainLife(true),
 		ExtraTurn(true),
 		BecomeCreature(true),

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

@@ -74,13 +74,19 @@ public class BecomesCreatureSourceEffect extends ContinuousEffectImpl<BecomesCre
 			switch (layer) {
 				case TypeChangingEffects_4:
 					if (sublayer == SubLayer.NA) {
-						if (token.getCardType().size() > 0)
+						if (token.getCardType().size() > 0) {
                             for (Constants.CardType t : token.getCardType()) {
-                                if (!permanent.getCardType().contains(t))
+                                if (!permanent.getCardType().contains(t)) {
                                     permanent.getCardType().add(t);
+								}
                             }
-						if (token.getSubtype().size() > 0)
+						}
+						if (type == null) {
+							permanent.getSubtype().clear();
+						}
+						if (token.getSubtype().size() > 0) {
 							permanent.getSubtype().addAll(token.getSubtype());
+						}
 					}
 					break;
 				case ColorChangingEffects_5:

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

@@ -27,6 +27,7 @@
  */
 package mage.abilities.effects.common.continious;
 
+import mage.Constants;
 import mage.Constants.Duration;
 import mage.Constants.Layer;
 import mage.Constants.Outcome;
@@ -72,10 +73,19 @@ public class BecomesCreatureTargetEffect extends ContinuousEffectImpl<BecomesCre
 			switch (layer) {
 				case TypeChangingEffects_4:
 					if (sublayer == SubLayer.NA) {
-						if (token.getCardType().size() > 0)
+						if (token.getCardType().size() > 0) {
-							permanent.getCardType().addAll(token.getCardType());
+							for (Constants.CardType t : token.getCardType()) {
-						if (token.getSubtype().size() > 0)
+								if (!permanent.getCardType().contains(t)) {
+									permanent.getCardType().add(t);
+								}
+							}
+						}
+						if (type == null) {
+							permanent.getSubtype().clear();
+						}
+						if (token.getSubtype().size() > 0) {
 							permanent.getSubtype().addAll(token.getSubtype());
+						}
 					}
 					break;
 				case ColorChangingEffects_5:
@@ -120,7 +130,7 @@ public class BecomesCreatureTargetEffect extends ContinuousEffectImpl<BecomesCre
         StringBuilder sb = new StringBuilder();
 		sb.append(duration.toString());
         sb.append(" target ").append(mode.getTargets().get(0).getTargetName()).append(" becomes a ").append(token.getDescription());
-		if (type.length() > 0)
+		if (type != null && type.length() > 0)
 			sb.append(" that's still a ").append(type);
         return sb.toString();
     }

Mage/src/mage/abilities/effects/common/continious/LoseAllAbilitiesTargetEffect.java

@@ -0,0 +1,82 @@
+/*
+* 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 mage.abilities.effects.common.continious;
+
+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 java.util.UUID;
+
+/**
+ *
+ * @author nantuko
+ */
+public class LoseAllAbilitiesTargetEffect extends ContinuousEffectImpl {
+
+	public LoseAllAbilitiesTargetEffect(Duration duration) {
+		super(duration, Layer.AbilityAddingRemovingEffects_6, SubLayer.NA, Outcome.AddAbility);
+	}
+
+	public LoseAllAbilitiesTargetEffect(final LoseAllAbilitiesTargetEffect effect) {
+		super(effect);
+	}
+
+	@Override
+	public LoseAllAbilitiesTargetEffect copy() {
+		return new LoseAllAbilitiesTargetEffect(this);
+	}
+
+	@Override
+	public boolean apply(Game game, Ability source) {
+		int affectedTargets = 0;
+		for (UUID permanentId : source.getTargets().get(0).getTargets()) {
+			Permanent permanent = game.getPermanent(permanentId);
+			if (permanent != null) {
+				permanent.getAbilities().clear();
+				affectedTargets++;
+			}
+		}
+		return affectedTargets > 0;
+	}
+
+	@Override
+	public String getText(Mode mode) {
+		StringBuilder sb = new StringBuilder();
+		sb.append("Target ").append(mode.getTargets().get(0).getTargetName()).append(" loses all abilities").append(duration.toString());
+		return sb.toString();
+	}
+
+}