The Dreadsower Does Devour (EDH / Commander)

1) Grismold, the Dreadsower has two win conditions, either voltron or semi aristocrats.
2) You're going to use a lot of sac effects to ramp or draw cards, with either moldervine reclamation, or vampiric rites. There are other avenue of draw in this deck. This plays well with your aristocrat win condition. There is plenty of ramp in there to keep Grismold out on the field. Black Market gets crazy fast. To the point where you might be able to combo with Slimefoot, the Stowaway, if there is a stall for some reason.

3) With Voltron, you're going to pump guys out onto the field to sacrifice/kill. Grismold does this well, but there is backup in the deck. Use the various -1/-1 -2/-2, sac ect to pump Grismold up. Phyresis, Prowler's Helm, Eternal Thirst, Gift of Doom for protection are your biggest voltron back-up. Grismold pumps himself very easily and doesn't need many pump spells. There does need to be a few more protection spells in this deck, and are what I would suggest to improve it.

4) With the Aristocats you're going to deal damage every time a creature dies. Zulaport Cutthroat, poison tip archer, Syr Konrad, the Grim, Falkenrath Noble do the job here.