Umi

Field Spell

All Fish, Sea Serpent, Thunder, and Aqua monsters on the field gain 200 ATK/DEF, also all Machine and Pyro monsters on the field lose 200 ATK/DEF.

Rulings – Yugipedia

Printings:

Legend of Blue Eyes White Dragon: LOB-050 (Common) - 2002-03-08
Legend of Blue Eyes White Dragon: LOB-E039 (Common) - 2002-03-08
Legend of Blue Eyes White Dragon: LOB-EN050 (Common) - 2002-03-08
Dark Beginning 1: DB1-EN112 (Common) - 2004-10-12
Speed Duel: Attack from the Deep: SBAD-EN031 (Common) - 2019-05-30
Speed Duel: Streets of Battle City: SBC1-ENC13 (Common) - 2023-08-24

Prices:

Cardmarket: 0.02 €
TCGplayer: $ 0.10