Impending Annihilation

Apocalyptic 5 (When this enters the battlefield,
sacrifice it and mill 5 unless the summed number of
cards you own in exile and in your graveyard is
greater than the number of cards in your library.)
When Impending Annihilation is put into your
graveyard from the battlefield, each player gains
5 life.
At the beginning of your upkeep, exile Impending
Annihilation and all nonland permanents.