Effect
When your opponent activates a monster effect: Detach 1 Xyz Material from a monster you control; negate the activation, and if you do, destroy that monster.
【Regarding the ① effect】
You can activate this card in direct chain to the activation of your opponent's monster effect.
You can also detach an Xyz Material from an Xyz Monster you control in face-down Defense Position as the cost to activate this card.
You can activate this card during the Damage Step.
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