Really great deck idea. +1 from me! I'm loving the mono-black. A few things that stood out to me while playtesting was sometimes I wouldn't have a sac outlet for card:Altar's Reap and I would be left open to attacks, Lotleth Troll with Rancor on turn 3-4 hurts to much. Have you considered splashing Plains for cards such as Doomed Traveler and/or Lingering Souls ? Also, I'm aware that card:Grafdigger's Cage is in the sideboard, but how do you deal with strong Reanimator Decks? Ones that can turn 4-5, or if assisted by Liliana of the Veil and discard an Unburial Rites to flashback for a Griselbrand , Angel of Serenity or Stormtide Leviathan ? I see that you do have a lot of spot removal, but if they can Unburial Rites it again, what could you do? No bashing on the deck, I think its great, just giving my 2. I look forward to seeing your reply!
I forgot to add Mind Rot , being a great 3CMC 2 discard card, is there a specific reason you're not running it?