Card Rulings:Wattmole

"Wattmole":

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TCG Rulings

• The effect to destroy a face-down Defense Position does not target.

• It activates immediately at the start of the Damage Step.

• If you attack a face-up monster and then activated "Book of Moon", if the attack target monster is in face-down Defense Position at the start of the Damage Step you can use this card’s effect to destroy it.