Neo-Spacian Aqua Dolphin (BLRR-EN049) [Battles of Legend: Relentless Revenge]

Once per turn: You can discard 1 card; look at your opponent's hand and choose 1 Monster Card in it. If you control a monster with ATK greater than or equal to the ATK of the chosen card, destroy the chosen card and inflict 500 damage to your opponent. Otherwise, take 500 damage.