Target 1 face-up monster on the field; it gains 500 ATK, and if you do, once during this turn, it cannot be destroyed by battle or by card effects. You can banish this card from your Graveyard, then target 1 "Phantom Knights" monster in your Graveyard; Special Summon it, but banish it when it leaves the field. You can only use this effect of "Phantom-Wing" once per turn.