Necrodoom

You can't gain life.

When Necrodoom enters, destroy all creatures. Then exchange your graveyard with your library. Then shuffle your library.

You may cast target creature card from a graveyard by paying life equal to its mana value rather than paying its
mana cost.
Whenever a creature dies, exile it, and you draw a card.

When there are no creatures in all graveyards, you lose the game.