[
    new MagicWhenOtherComesIntoPlayTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPermanent other) {
            final int numAllies = permanent.getController().getNrOfPermanents(MagicSubType.Ally);
            return (other.isFriend(permanent) &&
                    other.hasSubType(MagicSubType.Ally)) ?
                new MagicEvent(
                    permanent,
                    new MagicMayChoice(
                        MagicTargetChoice.NEG_TARGET_CREATURE_WITH_FLYING
                    ),
                    // estimated. Amount of damage can be different on resolution
                    new MagicDamageTargetPicker(numAllies),
                    this,
                    "PN may\$ have SN deal " +
                    "damage to target creature with flying\$ equal to " +
                    "the number of Allies he or she controls."
                ) :
                MagicEvent.NONE;
        }

        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            if (event.isYes()) {
                event.processTargetPermanent(game,new MagicPermanentAction() {
                    public void doAction(final MagicPermanent creature) {
                        final MagicPlayer player = event.getPlayer();
                        final int amount =
                                player.getNrOfPermanents(MagicSubType.Ally);
                        if (amount > 0) {
                            final MagicDamage damage = new MagicDamage(
                                event.getPermanent(),
                                creature,
                                amount
                            );
                            game.doAction(new MagicDealDamageAction(damage));
                        }
                    }
                });
            }
        }
    }
]