Mermail Abysstrite (CBLZ-EN050) - Cosmo Blazer Unlimited

3 Level 3 monsters // During either player's turn, when your opponent targets exactly 1 face-up "Mermail" monster you control for an attack, or with a Spell/Trap effect that could have targeted this card (except during the Damage Step): You can detach 1 Xyz Material from this card; that attack