added MagicHeroicTrigger for heroic mechanic

src/magic/model/trigger/MagicHeroicTrigger.java

@@ -0,0 +1,23 @@
+package magic.model.trigger;
+
+import magic.model.MagicGame;
+import magic.model.MagicPermanent;
+import magic.model.action.MagicSacrificeAction;
+import magic.model.event.MagicEvent;
+import magic.model.stack.MagicItemOnStack;
+
+public abstract class MagicHeroicTrigger extends MagicWhenTargetedTrigger {
+
+    public MagicHeroicTrigger(final int priority) {
+        super(priority);
+    }
+
+    public MagicHeroicTrigger() {}
+
+    @Override
+    public boolean accept(final MagicPermanent permanent, final MagicItemOnStack item) {
+        return item.isFriend(permanent) && 
+               item.isSpell() && 
+               item.containsInChoiceResults(permanent);
+    }
+}