Add Flanking ability

Mage/src/mage/abilities/keyword/FlankingAbility.java

@@ -0,0 +1,67 @@
+
+package mage.abilities.keyword;
+
+import mage.Constants;
+import mage.abilities.Ability;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.common.BecomesBlockedByCreatureTriggeredAbility;
+import mage.abilities.effects.Effect;
+import mage.abilities.effects.common.continious.BoostTargetEffect;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.target.targetpointer.FixedTarget;
+
+
+/**
+ *
+ * @author Plopman
+ */
+
+
+public class FlankingAbility extends TriggeredAbilityImpl<FlankingAbility> {
+
+    public FlankingAbility() {
+        super(Constants.Zone.BATTLEFIELD, new BoostTargetEffect(-1, -1, Constants.Duration.EndOfTurn), false);
+    }
+
+    public FlankingAbility(final FlankingAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        if (event.getType() == GameEvent.EventType.BLOCKER_DECLARED && event.getTargetId().equals(this.getSourceId())) {
+            Permanent permanent = game.getPermanent(event.getSourceId());
+            if(permanent != null)
+            {
+                boolean hasFlankingAbility = false;
+                for(Ability ability : permanent.getAbilities()){
+                    if(ability instanceof FlankingAbility){
+                        hasFlankingAbility = true;
+                    }
+                }
+                
+                if(!hasFlankingAbility){
+                    for (Effect effect : this.getEffects()) {
+                        effect.setTargetPointer(new FixedTarget(event.getSourceId()));
+                    }
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public String getRule() {
+        return "Flanking";
+    }
+
+    @Override
+    public FlankingAbility copy() {
+        return new FlankingAbility(this);
+    }
+
+    
+}

Utils/keywords.txt

@@ -11,6 +11,7 @@ Unearth|cost|
 Battle cry|new|
 Cascade|new|
 Exalted|new|
+Flanking|new|
 Forestwalk|new|
 Indestructible|new|
 Islandwalk|new|