Dark. Fiend/Xyz/Effect. 2 Level 12 monstersYou can also Xyz Summon this card by using 1 monster you control with the highest ATK during the turn, or the next turn after, your opponent Special Summoned 2 or more monsters from the Extra Deck. (Transfer its materials to this card.) If Summoned this way, you cannot Normal or Special Summon other monsters for the rest of this turn. Neither player can activate the effects of monsters with 3000 or more ATK while you control this Xyz Summoned card. Once per turn: You can detach 1 material from this card; return 1 monster on the field to the hand.