I agree with MrBarrelRoll. I was actually going to throw in Mitotic Slimes next since I just got a few myself. Best of luck with the tests.
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I actually tested this deck at a recent FNM just for fun. It's far too reliant on the Bloodthrone Vampire. If you manage to get the combo out once, you will not get it out again. Your opponents will save their creature control for that one creature. Without it, this deck is totally disabled. Recommend the Grim Discovery as previously suggested (tested with these, worked quite well), and I ran with Demon of Death's Gate, to fast sac the other vampires when I wasn't able to get a Bloodthrone out. I also recommend using Harrow instead of Birds of Paradise. Rarely did I get a Birds to play, and when I did, they were pretty useless. Harrow gives you the mana ramp you're desiring, as well as additional landfall, which means more Bloodghast sacrificing. Memnites were my suggestion previously because they would be a fast option as a blocker to the Lacerators, and not do damage do you. They could also be sacrificed and pulled back out with Grim Discovery, and played for free for another sacrifice immediately. Unnatural Predation worked like a charm. No one saw a 15/15 coming, and when they did, they blocked with their most worthless creature. Garruk was almost useless throughout the entire tournament, with a few times coming in useful using his untap ability. I also managed to get a few beasts out once, and used his trample ability once in a very long game. If you're using him solely for his trample ability, replace him with something else with a boost, like Groundswell, even if it doesn't give the trample you desire, it's a fast damage boost that will help. I also found that having a Groundswell at certain points would have saved my Bloodthrones from a Lightning Bolt. Alternatively, you could use Mirran Mettle to give the same desired effect, a boost, and/or shroud, thus saving your creature. Overall, it was an okay deck. I won 3/6 rounds, and had a lot of fun with people trying to grasp how I was sacrificing the Bloodghast so many times. No one saw the combo coming, but as I said before, once they knew about it, they never let it happen again. Demon of Death's Gate proved to be another unsuspecting surprise, especially on turn 2 (First hand: 2x Pulse Tracker, 1x Lacerator, 1x Demon of Death's Gate, x2 Swamp, 1x Forest).. I had another occasion with the Demon where I had Bloodthrone on the field, 3 other black creatures, and had Blade attached to her... so when I sacrificed the three creatures to Demon of Death's Gate, she became a 7/7 as well. Keep at it, do a few tests with some of the suggestions floating out here. I didn't have the Jinxed Idols to play with, so that's why I threw in the Demons instead. Good luck!
Personally I'd take out the Jinxed Idols. and/or trade the Lacerators for the Memnites.
For your sideboard, consider Smother and/or Feast of Blood for the possibility you're against artifacts (i.e. Memnite/Ornithoper decks).
Also maybe trade Quest for the Gravelord for the Jinxed Idol. With all the sacrificing you'll do, you'll be getting a 5/5 out fairly quickly. With Jinxed Idol, you have to pick which you sacrifice the creature to, between the Vampire or the Artifact.
Grim Discovery and Memnites would work really well in this deck, if you can fit them in somewhere. The ability to pull another creature to sac as well as another land pull from the graveyard (replaying Catacombs) will allow you to sac your Bloodghast even more. For one Black and one Colorless, it won't throw off your mana curve.