A Legendary Ocean

Field Spell

(This card's name is always treated as "Umi".)
All WATER monsters on the field gain 200 ATK/DEF. Reduce the Level of all WATER monsters in both players' hands and on the field by 1.

Rulings – Yugipedia

Printings:

Legacy of Darkness: LOD-078 (Common) - 2003-06-06
Legacy of Darkness: LOD-EN078 (Common) - 2003-06-06
Hobby League 1 participation cards B: HL1-EN003 (Common) - 2004-01-01
Structure Deck: Fury from the Deep: SD4-EN020 (Common) - 2005-05-09
Dark Beginning 2: DB-EN66 (Common) - 2005-07-27
Dark Beginning 2: DB2-EN187 (Common) - 2005-07-27
Retro Pack 2: RP02-EN062 (Common) - 2009-07-28
Realm of the Sea Emperor Structure Deck: SDRE-EN024 (Common) - 2012-10-11
Legendary Duelists: LEDU-EN021 (Common) - 2017-09-07
Legendary Duelists: Season 1: LDS1-EN029 (Common) - 2020-07-02
Speed Duel GX: Midterm Paradox: SGX2-ENC13 (Common) - 2022-10-06
Magnificent Mavens: MAMA-EN079 (Ultra Rare) - 2022-11-03
Speed Duel: Streets of Battle City: SBC1-ENI27 (Common) - 2023-08-24

Prices:

Cardmarket: 0.04 €
TCGplayer: $ 0.07