Ulamog, Plagued Endlessness

({p/c} can be paid with with {c} or 2 life)
When you cast this spell, each opponent sacrifices X permanents where X is number of poison counters they have.
Annihilator 4, Infect
When Ulamog, Plagued Endlessness is put into your graveyard from anywhere, it's owner shuffles their graveyard into their library and gets a poison counter.