Vermivorous, The Invincible

Indestructible, Flying, Trample
When Vermivorous, The Invincible enters the battlefield exile all graveyards and deal X damage to all creatures target opponent controls, where X is the amount of creatures and artifacts exiled by Vermivorous, The Invincible.
When Vermivorous, The Invincible leaves the battlefield return any amount of exiled cards to your hand, library, or graveyard.