The Unspoken

Unseal 10 (If this card would be exiled or put into a graveyard, instead exile it with 10 pact counters on it.)
The Unspoken cannot be cast or enter the battlefield.
Whenever a creature is sacrificed, remove a pact counter from The Unspoken. If there are no pact counters on The Unspoken, all other players lose
the game.