Ob Nixilis of the Black Oath

[+2]: Each opponent loses 1 life. You gain life equal to the life lost this way.
[−2]: Create a 5/5 black Demon creature token with flying. You lose 2 life.
[−8]: You get an emblem with "{1}{B}, Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature's power."
Ob Nixilis of the Black Oath can be your commander.