Maiden of the Aqua

Level 4 WATER/Aqua Effect
700 ATK / 2000 DEF

As long as this card remains face-up on the field, the field is treated as "Umi" (however there is no increasing or decreasing of ATK/DEF due to "Umi"'s effect). If there is an active Field Spell Card on the field, this effect is not applied.

Rulings – Yugipedia

Printings:

Pharaonic Guardian: PGD-008 (Short Print) - 2003-07-18
Dark Beginning 2: DB2-EN211 (Common) - 2005-07-27
Speed Duel: Streets of Battle City: SBC1-ENC07 (Common) - 2023-08-24

Prices:

Cardmarket: 0.23 €
TCGplayer: $ 0.26