Number C65: King Overfiend
3 Level 3 DARK monsters
Once per turn: You can detach 1 Xyz Material from this card, then target 1 face-up monster your opponent controls; it loses 1000 ATK and DEF. While this card has "Number 65: Djinn Buster" as an Xyz Material, it gains this effect.
● Effect Monsters your opponent controls cannot activate their effects.