The Wicked Eraser

Level 10 DARK/Fiend Effect
? ATK / ? DEF

This card cannot be Special Summoned. This card cannot be Normal Summoned or Set except by Tributing 3 monsters. The ATK and DEF of this card are each equal to the number of cards your opponent controls x 1000. When this card is destroyed and sent to the Graveyard, destroy all cards on the field. During your Main Phase, you can destroy this card.

Rulings – Yugipedia

Printings:

Shonen Jump Vol. 5, Issue 9 promotional card: JUMP-EN016 (Ultra Rare) - 2007-09-01
Collectible Tins 2010 Wave 1: CT07-EN011 (Super Rare) - 2010-08-31
King's Court: KICO-EN062 (Rare) - 2021-07-08

Prices:

Cardmarket: 0.02 €
TCGplayer: $ 0.15