Olzenrenth, Lord of the Dead

Flying, trample
When Olzenrenth enters the battlefield, create
a 2/2 black zombie creature token.
{b}{r}, Sacrifice a creature: Olzenrenth, Lord of
the Dead gains +X/+X until end of turn, where
X is the sacrificed creatures power.
Whenever a player sacrifices a creature, each
opponent loses 1 life. You gain life equal to
amount of life lost this way.
"If you know how I value your life, then you know
you should run."