I had a similar idea with a mono-black deck, running more discard/extract/sacrifice spells and less but stronger creatures. This is indeed a mean deck. Maybe adding some counters sideboard could solve a lot of problems.Good luck !
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Good deck. You have some pretty good creatures who synergize well, Bloodghast to fuel the sacrifice machine, you can draw a bit with Sign in Blood. On a negative note, I think you focus a lot on creatures; what if your opponent play an instant/sorcery kind of deck ? Maybe considering a Painful Quandary or something like Dash Hopes sideboard could give better options to your deck.Good luck. ;)