Back Alley Skulker

Haste, Skulk
Mercenary {1} (At the beginning of each player's
upkeep, that player may pay {1}. If they do, they gain control of this creature, then untap it. It can't be sacrificed.)
Whenever Back Alley Skulker deals combat
damage to an opponent, you may draw a card.
If you do discard a card.