Vincent the Voidbound

Indestructible, Perpetual (This creature cannot be sacrificed.)
Whenever Vincent the Voidbound attacks, each
player sacrifices a black creature. If any player
can't, Vincent the Voidbound deals X damage to
that player where X is the greatest power among
creatures they control plus 1.
Sacrifice a creature: Draw cards equal to the
most life an opponent lost this turn.