Implemented Boros Challenger

Mage/src/main/java/mage/abilities/keyword/MentorAbility.java

@@ -0,0 +1,56 @@
+package mage.abilities.keyword;
+
+import mage.abilities.common.AttacksTriggeredAbility;
+import mage.abilities.effects.common.counter.AddCountersTargetEffect;
+import mage.cards.Card;
+import mage.counters.CounterType;
+import mage.filter.common.FilterCreaturePermanent;
+import mage.filter.predicate.ObjectSourcePlayer;
+import mage.filter.predicate.ObjectSourcePlayerPredicate;
+import mage.filter.predicate.permanent.AttackingPredicate;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.target.common.TargetCreaturePermanent;
+
+/**
+ *
+ * @author TheElk801
+ */
+public class MentorAbility extends AttacksTriggeredAbility {
+
+    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent("attacking creature with lesser power");
+
+    static {
+        filter.add(new AttackingPredicate());
+        filter.add(new MentorAbilityPredicate());
+    }
+
+    public MentorAbility() {
+        super(new AddCountersTargetEffect(CounterType.P1P1.createInstance()), false);
+        this.addTarget(new TargetCreaturePermanent(filter));
+    }
+
+    public MentorAbility(final MentorAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public String getRule() {
+        return "mentor <i>(Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)</i>";
+    }
+
+    @Override
+    public MentorAbility copy() {
+        return new MentorAbility(this);
+    }
+
+}
+
+class MentorAbilityPredicate implements ObjectSourcePlayerPredicate<ObjectSourcePlayer<Card>> {
+
+    @Override
+    public boolean apply(ObjectSourcePlayer<Card> input, Game game) {
+        Permanent sourcePermanent = game.getPermanentOrLKIBattlefield(input.getSourceId());
+        return sourcePermanent != null && input.getObject().getPower().getValue() < sourcePermanent.getPower().getValue();
+    }
+}