I'd keep Thraximundar :P That along with Defiler of Souls and lots of sacrifices makes really big, really fast. Malfegor looks fun to use too if you're playing multiplayer. I can just imagine how strong Thraximundar would get after that! xD As far as recommendations go, maybe add some goblin outlanders and zombie outlanders? Protection earlier on would help you stall your opponent so you could get Nicol Bolas out a bit easier, especially since a lot of the cards out there now are multicolor xD
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Now this I like :D Even with very few creatures in this deck, it looks like 10 creatures is more than enough to handle just about anything other than another burn deck or a counterspell deck. Nice job thinking outside the box ;) The only thing I would change is turning Blaze into Banefire (even if its expensive as hell!) and maybe switch Volcanic Hammer with Lightning Bolt (Thank you M10!)
Wow! Really nice deck! I definitely wouldn't want to play against you if you're running this. Constantly unsummoning and removing my creatures would get annoying xD Plus those sphinx cards look really scare when they hit the battlefield turn 4-5 o_0