[
    new MagicWhenAttacksTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPermanent creature) {
            return (permanent==creature) ?
                new MagicEvent(
                    permanent,
                    this,
                    "SN gets +2/+0 until end of turn for each other attacking Goblin."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final MagicPermanent creature=event.getPermanent();
            final Collection<MagicPermanent> targets=
                game.filterPermanents(creature.getController(),MagicTargetFilter.TARGET_ATTACKING_GOBLIN);
            //excluding itself
            final int power = 2 * (targets.size() - 1);
            if (power>0) {
                game.doAction(new MagicChangeTurnPTAction(creature,power,0));
            }
        }
    }
]