Severel, the Plaguebringer

Whenever Severel or another Human you control deals combat damage, you get a poison counter. (If you have 10 or more poison counters, you lose the game.)

{x} Remove a poison counter from a player: put
X -1/-1 counters on target nonartifact creature.

I might be sick, but I'm still the one to fear.
—Severel