Perfect Freeze

Rio Kastle Character Image
Can be used if you control a WATER Winged Beast-Type Xyz Monster and your opponent controls at least 1 face-up monster. The card effects of all face-up cards on the field except WATER Winged Beast-Type Xyz Monsters you control will be negated until the end of the turn. In addition, select 1 opponent's monster and decrease its ATK by the number of cards negated by this Skill x300 until the end of the turn. This Skill can only be used once per Duel.