Refactored counters on permanents counting

Added BecomeMonstrousTriggeredAbility 
Added Target and Filter class for creature an opponent controls

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

@@ -0,0 +1,60 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package mage.abilities.common;
+
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.Effect;
+import mage.constants.Zone;
+import mage.filter.common.FilterCreaturePermanent;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.target.targetpointer.FixedTarget;
+
+/**
+ *
+ * @author Styxo
+ */
+public class BecomesMonstrousTriggeredAbility extends TriggeredAbilityImpl {
+
+    protected FilterCreaturePermanent filter = new FilterCreaturePermanent();
+
+    public BecomesMonstrousTriggeredAbility(Effect effect) {
+        super(Zone.BATTLEFIELD, effect, false);
+    }
+
+    public BecomesMonstrousTriggeredAbility(final BecomesMonstrousTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public BecomesMonstrousTriggeredAbility copy() {
+        return new BecomesMonstrousTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.BECOMES_MONSTROUS;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        Permanent permanent = game.getPermanent(event.getTargetId());
+        if (filter.match(permanent, sourceId, controllerId, game)
+                && (permanent.getControllerId().equals(this.controllerId))) {
+            for (Effect effect : this.getEffects()) {
+                effect.setTargetPointer(new FixedTarget(event.getTargetId()));
+            }
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public String getRule() {
+        return "Whenever " + filter.getMessage() + " becomes monstrous, " + super.getRule();
+    }
+}