magarena/release/Magarena/scripts/Gristleback.groovy

[
    new MagicPermanentActivation(
        new MagicActivationHints(MagicTiming.Removal),
        "Life"
    ) {
        @Override
        public Iterable<MagicEvent> getCostEvent(final MagicPermanent source) {
            return [new MagicSacrificeEvent(source)];
        }
        @Override
        public MagicEvent getPermanentEvent(final MagicPermanent source, final MagicPayedCost payedCost) {
            return new MagicEvent(
                source,
                this,
                "PN gains life equal to SN's power."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            game.doAction(new MagicChangeLifeAction(
                event.getPlayer(),
                event.getPermanent().getPower()
            ));
        }
    }
]