Advanced format ruling
Neo-Spacian Aqua Dolphin
Card effect (current official text)Once per turn: You can discard 1 card; look at your opponent's hand and choose 1 monster. If you control a monster with ATK greater than or equal to the ATK of the chosen card, destroy the chosen card, and if you do, inflict 500 damage to your opponent. Otherwise, take 500 damage.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.