magarena/release/Magarena/scripts/Havoc_Demon.groovy

[
    new MagicWhenDiesTrigger() {
        @Override
        public MagicEvent getEvent(final MagicPermanent permanent) {
            return new MagicEvent(
                permanent,
                permanent.getController(),
                this,
                "All creatures get -5/-5 until end of turn."
            );
        }
        @Override
        public void executeEvent(
                final MagicGame game,
                final MagicEvent event) {
            final Collection<MagicPermanent> targets=
                game.filterPermanents(event.getPlayer(),MagicTargetFilter.TARGET_CREATURE);
            for (final MagicPermanent target : targets) {
                game.doAction(new MagicChangeTurnPTAction(target,-5,-5));
            }
        }
    }
]