Pact-Fortified Lich

Lifelink, Indestructible, Ward {2}
You can't lose the game.
Whenever you gain life, draw that many cards.
If you or Pact-Fortified Lich would be dealt damage, prevent that damage. For each 10 damage prevented this way, mill a card, discard a card, sacrifice a creature, a land, and a noncreature, nonland permanent, and exile four cards from your graveyard.
When Pact-Fortified Lich leaves the battlefield, you lose the game.