Bossk, Ruler of Them All

Whenever a creature an opponent controls, for each colorless mana on the card, discard that many cards from the top of an opponents library into their graveyard.
"This guy is the greatest bounty hunter of them all, His bounty hunter pals are: Boba Fett, 4-LOM, Zuccuss, dengar, and his master,
Jabba the Hutt."