simplified and consolidated werewolf triggered abilities

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

@@ -0,0 +1,35 @@
+package mage.abilities.common;
+
+import mage.abilities.condition.common.TwoOrMoreSpellsWereCastLastTurnCondition;
+import mage.abilities.effects.common.TransformSourceEffect;
+import mage.constants.TargetController;
+import mage.game.Game;
+
+/**
+ * @author TheElk801
+ */
+public class WerewolfBackTriggeredAbility extends BeginningOfUpkeepTriggeredAbility {
+
+    public WerewolfBackTriggeredAbility() {
+        super(new TransformSourceEffect(false), TargetController.ANY, false);
+    }
+
+    private WerewolfBackTriggeredAbility(final WerewolfBackTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public boolean checkInterveningIfClause(Game game) {
+        return TwoOrMoreSpellsWereCastLastTurnCondition.instance.apply(game, this);
+    }
+
+    @Override
+    public WerewolfBackTriggeredAbility copy() {
+        return new WerewolfBackTriggeredAbility(this);
+    }
+
+    @Override
+    public String getRule() {
+        return "At the beginning of each upkeep, if a player cast two or more spells last turn, transform {this}.";
+    }
+}