2 Level 3 Fiend-Type monsters

Once per turn, during either player s turn: You can detach 1 Xyz Material from this card, then target 1 Dark Contract card you control; destroy it, and if you do, draw 1 card. If this card battles an opponent s monster, during damage calculation: You can detach 1 Xyz Material from this card; make this card unable to be destroyed by that battle, destroy the opponent s monster that battled it after damage calculation, and if you do, inflict 500 damage to your opponent.