Spellbook of Power (REDU-EN058) - Return of the Duelist Unlimited

Target 1 face-up Spellcaster-Type monster you control; until the End Phase, it gains 1000 ATK. Also, until the End Phase, each time it destroys an opponent's monster by battle: You can add 1 "Spellbook" Spell Card from your Deck to your hand. You can only activated 1 "Spellbook of Power" per turn.