[
    new MagicWhenComesIntoPlayTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent, final MagicPayedCost payedCost) {
            return MagicCondition.METALCRAFT_CONDITION.accept(permanent) ?
                new MagicEvent(
                    permanent,
                    MagicTargetChoice.NEG_TARGET_PLAYER,
                    this,
                    "Target player\$ loses 4 life and PN gains 4 life."
                ) :
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            event.processTargetPlayer(game,new MagicPlayerAction() {
                public void doAction(final MagicPlayer player) {
                    game.doAction(new MagicChangeLifeAction(player,-4));
                    game.doAction(new MagicChangeLifeAction(event.getPlayer(),4));
                }
            });
        }
    }
]