Card Rulings:Number C65: King Overfiend

"Number C65: King Overfiend":

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OCG Rulings

• The effect that reduces the ATK and DEF of a monster by 1000 targets 1 face-up monster the opponent controls.

• Detaching 1 Xyz Material from this card is a cost to activate the effect that reduces the ATK and DEF of a monster by 1000.

• The ATK and DEF of a monster remain reduced as long as it remains face-up on the field.