So first off, the suggestion of Ogre Slumlord strikes me as a good one. I would also say to drop Hythonia, Nightmare, and Abhorrent Overlord for 3x Sanguine Bond (or potentially Vizkopa Guildmage as an alternative). I would focus on SMALL 1-2 drop creatures that you'll happily sack to Bubbling Cauldron as it, paired with Dark Prophecy actually sounds like a decent engine. But something like Sanguine Bond/Guildmage should be your win-con.
A few thoughts aside from what I state above:
1) Nykthos, Shrine to Nyx is going to be nice in any monocolored deck as it can easily result in a ramping action - see Cabal Coffers if you're unsure. It's a slightly different effect, but it's quite the useful card.
2) Whip of Erebos could be big here, as you can use it to reanimate things and then turn around and sack them to the cauldron before you exile them at the end of the turn (yes, they still get exiled, but still).
3) Sadly the timing of this deck is about a month late, as Blood Artist would've fit in here beautifully. Without this ability though, you really don't have much punch to finish games.
4) Hero's Downfall will be huge for you. If there were a black sweeper, that would be awesome, but there really isn't one for the time being.
5) Quag Sickness is decent SB tech for a deck with a lot of black as it can translate into a god killer if they ever get Heliod/Purphoros/Thassa online.
Anywhom, seems neat enough to fiddle with. I can say that you're likely going to lose at FNMs and such, a LOT, but then again, playing with something different is always a lot of fun.
Good luck!
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