Papyrus, The Disbeliever

Vigilance, Menace
All creatures lose lifelink and can't gain lifelink.
All players can't gain life.(excludes life resets.)
When Papyrus, the Disbeliever enters the battlefield, deal X damage to
target opponent, where X is the number
of creatures in your graveyard.
Papyrus's power is equal to the amount of
creatures in your graveyard.