U.A. Playmaker (SECE-EN087) - Secrets of Eternity Unlimited

You can Special Summon this card (from your hand) by returning 1 "U.A." monster you control to the hand, except "U.A. Playmaker". You can only Special Summon "U.A. Playmaker" once per turn this way. When another "U.A." monster you control declares an attack: You can have this card lose exactly 800 ATK, and if it does, your attacking monster gains 800 ATK.