Neo-Spacian Aqua Dolphin

Level 3 WATER/Warrior Effect
600 ATK / 800 DEF

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.

Rulings – Yugipedia

Printings:

Power of the Duelist: POTD-EN003 (Super Rare) - 2006-08-16
Power of the Duelist: POTD-EN003 (Ultimate Rare) - 2006-08-16
Duelist Pack: Jaden Yuki 2: DP03-EN005 (Rare) - 2007-02-07
Legendary Collection 2: The Duel Academy Years Mega Pack: LCGX-EN017 (Common) - 2011-10-04
Battles of Legend: Relentless Revenge: BLRR-EN049 (Ultra Rare) - 2018-06-28
Legendary Duelists: Magical Hero: LED6-EN018 (Common) - 2020-01-16
Legendary Duelists: Season 3: LDS3-EN101 (Common) - 2022-07-21
Rarity Collection 5: RA05-EN088 (Starlight Rare) - 2026-04-09
Rarity Collection 5: RA05-EN088 (Ultra Rare) - 2026-04-09

Prices:

Cardmarket: 0.02 €
TCGplayer: $ 0.16