A B/G graveyard deck with no dredge cards. Hmmm... How about Shambling Shell? He fits your zombie tribal theme, makes other zombies stronger and puts stuff in your grave. Lotleth Troll doesn't dredge, but his effect is pretty similar.

Maybe Life from the Loam or Dakmor Salvage? I always like zombie decks though so +1 from me!

Hmmm, interesting suggestions. Lotleth Troll would be an interesting sub for marrow chomper...not sure if I like dredge that much though...

Cellar Door is good for not only giving you zombies, but also for putting creatures into your opponent's graveyard. Also, with the amount of creatures you have in this deck, Endless Ranks of the Dead would work wonders here. It is a must for pretty much every zombie deck.

Ooo, very nice suggestions my friend, now to figure out what to take out...