Masked HERO Acid

Level 8 WATER/Warrior Fusion Effect
2600 ATK / 2100 DEF

Must be Special Summoned with "Mask Change". When this card is Special Summoned: Destroy as many Spells and Traps your opponent controls as possible, and if you do, all monsters they control lose 300 ATK.

Rulings – Yugipedia

Printings:

Premium Collection Tin: PRC1-EN018 (Secret Rare) - 2012-03-16
Toon Chaos: TOCH-EN045 (Super Rare) - 2020-06-18

Prices:

Cardmarket: 0.38 €
TCGplayer: $ 0.46