2 Level 12 monsters

You can also Xyz Summon this card by using a Rank 10 or 11 DARK Xyz Monster you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) If Summoned this way, the following effect cannot be activated this turn. Once per turn: You can detach 2 Xyz Materials from this card; banish as many Special Summoned monsters your opponent controls as possible, then attach 1 of those banished monsters to this card as Xyz Material. If this face-up card on the field would be destroyed by battle or card effect, you can detach 1 Xyz Material from this card instead.