Battlin' Boxer Counterpunch (LTGY-EN020) - Lord of the Tachyon Galaxy Unlimited

During the Damage Step of either player's turn, when a "Battlin' Boxer" monster you control is attacking or being attacked: You can banish this card from your hand or Graveyard; that monster gains 1000 ATK until the End Phase. You can only use the effect of "Battlin' Boxer Counterpunch" once per turn.