magarena/release/Magarena/scripts/Kavu_Predator.groovy

[
    new MagicWhenLifeIsGainedTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicLifeChangeTriggerData lifeChange) {
            return permanent.isOpponent(lifeChange.player) ?
                new MagicEvent(
                    permanent,
                    lifeChange.amount,
                    this,
                    "Put RN +1/+1 counters on SN."
                ) :
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            game.doAction(new MagicChangeCountersAction(
                event.getPermanent(),
                MagicCounterType.PlusOne,
                event.getRefInt(),
                true
            ));
        }
    }
]