An interesting card you might want to try is Core Prowler (2/2, 4 colorless, infect, and when it's sent to the graveyard proliferate). You can sub them in for the Corpse Cur, because they have infect and the same cost, power, and toughness, just a different ability, which I think is better for this deck as it can be a problem for control decks mid to late game which is where I think this deck struggles a bit.
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It would be interesting to try Fire Servants in this deck to be able to deal 2 sets of 6 damage for 1 mana with a lightning bolt. Reverberate could also be very useful when used with Pyromancer Ascension allowing you to copy a lightning bolt, or any other instant/sorcery spell, 5 times for a total of 6 (not sure on official ruling, this is just based on my judgement) for just 2 extra mana. Just some interesting combos to think about. All-around solid deck
I agree with dhruvseth. Add in mana acceleration to get the dragons out quicker. Also, i suggest adding in some more burn cards like lightning bolt. If you take out the goblins for dragons, lightning bolts could help even more because they can take out the weaker creatures if they become a problem.
I think you should definitely take out the Bloodthrones. I would replace them with Mirri the Cursed if you want. Also, i'm not a fan of the land gain in a vampire deck. If you want it keep it, but I would suggest putting in creature destruction like doomblade and replace green with blue to make it control.
Very interesting deck idea. I do love the sac eldrazi spawn for devour concept. You may have to tweak this deck around a bit though and take out some of the weaker cards and put in more of the better cards like the devour dragons or you will be waiting around all game to draw them.