magarena/release/Magarena/scripts/Blowfly_Infestation.groovy

[
    new MagicWhenOtherDiesTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPermanent otherPermanent) {
            return (otherPermanent.isCreature() &&
                    otherPermanent.getCounters(MagicCounterType.MinusOne) > 0) ?
                new MagicEvent(
                    permanent,
                    MagicTargetChoice.TARGET_CREATURE,
                    new MagicWeakenTargetPicker(1,1),
                    this,
                    "Put a -1/-1 counter on target creature\$."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            event.processTargetPermanent(game,new MagicPermanentAction() {
                public void doAction(final MagicPermanent creature) {
                    game.doAction(new MagicChangeCountersAction(creature,MagicCounterType.MinusOne,1,true));
                }
            });
        }
    }
]