Bounty Hunters' Guild

At the beginning of each end step, put a bounty counter on a random creature without a bounty counter on it.
For as long as creature has a bounty counter on
it, it has "whenever this creature dies each
opponent draws a card and gains life equal to this creature's toughness" and it deals double damage.
Whenever you roll chaos, search your library for
a creature card and put it on the battlefield. It
enters the battlefield with a bounty counter on it.