public Glass(GameState state) {
      super(
          state,
          "Whenever this creature becomes the target of a spell or ability for the first time in a turn, counter that spell or ability.");

      SimpleEventPattern pattern = new SimpleEventPattern(EventType.BECOMES_TARGET);
      pattern.put(
          EventType.Parameter.TARGET,
          RelativeComplement.instance(ABILITY_SOURCE_OF_THIS, TargetedThisTurn.instance()));
      state.ensureTracker(new TargetedThisTurn.Tracker());

      SetGenerator thatSpell =
          EventParameter.instance(
              TriggerEvent.instance(This.instance()), EventType.Parameter.OBJECT);
      this.addEffect(counter(thatSpell, "Counter that spell or ability."));
    }
 @Override
 public org.rnd.jmagic.engine.Set evaluate(GameState state, Identified thisObject) {
   Set ret = new Set();
   for (int ID : state.getTracker(Tracker.class).getValue(state)) ret.add(state.get(ID));
   return ret;
 }