Refactored counters on permanents counting

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

Mage/src/main/java/mage/abilities/dynamicvalue/common/CountersSourceCount.java

@@ -0,0 +1,45 @@
+package mage.abilities.dynamicvalue.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.effects.Effect;
+import mage.counters.CounterType;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+
+public class CountersSourceCount implements DynamicValue {
+
+    private final CounterType counter;
+
+    public CountersSourceCount(CounterType counter) {
+        this.counter = counter;
+    }
+
+    public CountersSourceCount(final CountersSourceCount countersCount) {
+        this.counter = countersCount.counter;
+    }
+
+    @Override
+    public int calculate(Game game, Ability sourceAbility, Effect effect) {
+        Permanent permanent = game.getPermanentOrLKIBattlefield(sourceAbility.getSourceId());
+        if (permanent != null) {
+            return permanent.getCounters().getCount(counter);
+        }
+        return 0;
+    }
+
+    @Override
+    public CountersSourceCount copy() {
+        return new CountersSourceCount(this);
+    }
+
+    @Override
+    public String toString() {
+        return "1";
+    }
+
+    @Override
+    public String getMessage() {
+        return counter.getName() + " counter on {this}";
+    }
+}