The Wicked Eraser

[ Fiend / Effect ] 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. ATK/ 0 DEF/ 0