The combo doesn't work, I am almost positive as pureincongnito1 has said, Artifact isn't a creature type you can choose, so you wouldn't be able to give your eldrazi creatures the type "Artifact" or "Artifact Creature". Great idea though if it were able to work.
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No, you are right about the eldrazi, I forgot that the Emarkul and Ulamog can't actually stay in the graveyard, so I think we should take the Emarkul out and put back in the It That Betrays, it seems to be a better fit and the casting cost isn't too high at that point.
the list looks pretty good, you think keep in those 2 eldrazi creatures would be better than having 1 ulamog in there in place of one of them? I'll try your list out on Friday, then we can see how it runs and if we need to make any changes.
The 2 vendettas are coming out, smother is much better, also the baneful omen might be cut as it seems too slow at costing 7, perhaps for another specter.