2 Level 4 Chronomaly monsters
Once per turn, during either player s turn: You can detach 1 Xyz Material from this card, then target 1 face-up monster your opponent controls; change its ATK to 0 until the end of this turn. You can Tribute 1 Chronomaly monster, then target 1 monster your opponent controls, whose current ATK is different from its original ATK; destroy that target.