Regardless, Gravecrawler is there to provide one-mana sac fodder, opening up combo opportunities and generally doing everything but blocking
Durable Body can, on a coin flip, prevent KO and save it with 10 HP instead
Other times, cards will allow you to flip the coin so many times that it wont matter if you get a few tails along the way
Genestealer Patriarch The only downside is that Genestealer Patriarch still has to be around when the creature with the infection counter dies
Great flavor, good mechanics
Players have done it with Chalice of the Void and Storm, with Ancient Grudge and Affinity, and theyre doing it now with Dredge with a variety of hate cards