magarena/release/Magarena/scripts/Soulcage_Fiend.groovy

[
    new MagicWhenDiesTrigger() {
        @Override
        public MagicEvent getEvent(final MagicPermanent permanent) {
            return new MagicEvent(
                permanent,
                this,
                "Each player loses 3 life."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            for (final MagicPlayer player : game.getPlayers()) {
                game.doAction(new MagicChangeLifeAction(player,-3));
            }
        }
    }
]