[
    new MagicWhenDamageIsDealtTrigger() {
        @Override
        public MagicEvent executeTrigger(
                final MagicGame game,
                final MagicPermanent permanent,
                final MagicDamage damage) {
            return (damage.getSource()==permanent && 
                    damage.getTarget().isPlayer() && 
                    damage.isCombat()) ?
                new MagicEvent(
                    permanent,
                    new MagicMayChoice(
                        new MagicPayManaCostChoice(MagicManaCost.create("{2}{G}"))
                    ),
                    this,
                    "You may\$ pay {2}{G}\$. If you do, put six +1/+1 counters on SN."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            if (event.isYes()) {
                game.doAction(new MagicChangeCountersAction(
                    event.getPermanent(),
                    MagicCounterType.PlusOne,
                    6,
                    true
                ));
            }
        }
    }
]