magarena/release/Magarena/scripts/The_Rack.groovy

[
    new MagicAtUpkeepTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game, final MagicPermanent permanent, final MagicPlayer upkeepPlayer) {
            return upkeepPlayer == permanent.getChosenPlayer() ?
                new MagicEvent(
                    permanent,
                    upkeepPlayer,
                    this,
                    "SN deals X damage to PN where X is 3 minus the number of cards in his or her hand."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final MagicPlayer player = event.getPlayer();
            final int amount = 3 - player.getHandSize();
            if (amount > 0) {
                final MagicDamage damage = new MagicDamage(
                    event.getSource(),
                    player,
                    amount
                );
                game.doAction(new MagicDealDamageAction(damage));
            }
        }
    }
]