Eternus, Flame of Destruction

Flying, Deathtouch, Menace
Whenever this creature deals combat damage to a player, that player sacrifices three permanents.
Whenever this creature attacks, it deals damage to
each creature the defending player controls equal
to the number of creatures in their graveyard.
When this creature dies, destroy each nonland permanent target opponent controls, then put it
in your library third from the top.
Entire planes trembled when he woke, and crumbled
when he slept.