Battlin' Boxer Counterpunch (MP14-EN006) - 2014 Mega-Tins Mega Pack 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.