“This card destroys one of your cards by discarding one card in my hand.” Kaiba discarded a card in his hand.
“Destroy his Toon World, XYZ-Dragon Cannon!”

XYZ-Dragon Cannon’s gigantic turrets are positioned Toon World with a low charging sound.

“Oh no!” Pegasus’ grievous cry vanished in the vicious sound of gunfire. Toon World was thoroughly destroyed
instantly. The Toons, having lost the protection of their world, shrieked and turned into light dust.

Yugioh Pyramid of Light pg 9