The Raz'ac

Hexproof, Wither (This deals damage to creatures
in the form of -1/-1 counters.)
When The Ra'zac enters the battlefield, create a
2/3 black Horror creature token with Hexproof
and Wither.
"They are the monsters in the dark, the dripping nightmares that haunt your race... All areas where
humans are weak, the Ra'zac are strong."
---Oromis