Number 101: Silent Honor ARK

2 Level 4 monsters You can detach 2 Xyz Materials from this card, then target 1 Special Summoned monster your opponent controls in face-up Attack Position; attach it to this card as a face-up Xyz Material. You can only use this effect of "Number 101: Silent Honor ARK" once per turn. If this face-up card would be destroyed, you can detach 1 Xyz Material from this card instead.