check out my grixis list its called cameron bowman...

Steam Vents Blood Crypt . Niv-Mizzet, Dracogenius makes a pretty good finisher for these decks.

Yeah unfortunately I don't have any Vents or Crypts. I had thought about Niv-Mizzet but still not sure he's a little expensive, I do like the card draw though. I may try to find a place for him. What do you think would be a good number of them to put in, 3? What would be a good card or cards to replace with him? Right now though my main win con is split between Nicol Bolas, Planeswalker and/or Cryptborn Horror If I can get Increasing Vengeance with a miracled Thunderous Wrath I can have a 10/10 (plus more if I attack) Horror with trample. Any other advice would be great. If i can get my hands on the shock lands I will definitely be putting them in, but I don't have the money to buy them at the moment and no-one I play with is trading theirs at the moment.

Annihilating Fire isn't that good. If you really want the exiling effect I would use Pillar of Flame . If your looking for instant speed try Searing Spear .