May also want to consider replacing a few of the Doom Blades with a couple Hideous Ends sure it costs 1 more swamp but your opponent also loses 2 life.
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Nice deck dude! Might want to add some Vampire Nocturnuses into your sideboard for consideration.
Damn... sorry I'm at a loss for words at the moment but I have to say that is a fantastic use for Pyromancer's Ascension, especially with Spawning Breath; that's one hell of a creative way to get Emrakul out to the field. Overall I'd have to say this deck is both creative and original. I'd much like to recreate it.
Nocturnus***
May want to pick up a few Vampire Noctunuses.
Well, your certainly aiming in the right direction. There are however a few things you may need or want. You may wish to put in some fetch lands so you can return Bloodghast whenever you want. Another thing I would recommend for this kind of vampire deck would be the addition of 4 Vampire Nocturnus.
Seen your decks... very impressive! You both may want to put a Lilianna Vess and a Garruk Wildspeaker in your sideboards. This will prove to be quite a great combo if your ready to pop both of their combos within the two turns, so when your girlfriend uses Lilianna's ability to bring back any dead creatures you or your opponent may have and then use these new creatures when you have pumped them up even more with Garruk. This is not needed, it is just a suggestion.
Might want to put a Garruk or two in there just in case your opponent isn't partial to Beastmaster ascension. Mostly just him in your sideboard.