Dreamborn Levaithan

Flash
Whenever Dreamborn Levaithan enters the battlefield or attacks, exile each player's graveyard.
Unearth {2}{u/b}{u/b}{u/b} (Return this card from your graveyard to the battlefield. It gains haste. Exile it at
the beginning of the next end step or if it would leave
the battlefield. Unearth only as a sorcery.)