Empress of Prophecy (AP05-EN020) - Astral Pack 5 Unlimited

2 Level 5 Spellcaster-Type monsters
This card gains 300 ATK for each Xyz Material attached to a monster you control. Once per turn: You can detach 1 Xyz Material from this card; shuffle your Deck, then reveal the top 5 cards of your Deck and destroy monsters on the field up to the number of "Spellbook" cards revealed, then return the revealed cards to the top of the Deck in any order.