Your only creatures without infect are your land and the 1 carnifex demon... 4 tainted strikes will suffice, the exoskeleton will just slow you down. I'd drop them for something like a thrummingbird if you're looking to keep it budget :)
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I think the archdruids are pointless in this deck. By the time you get them out, they aren't really worth the chance that they can give you maybe 2 mana? With just the llanowar in there, doesn't seem like it would help. You could replace with naturalize? It would be another artifact destruction card. Or you could go with garruk... always a good mana ramp option plus the overrun built in.
I'd say add some search lands aside from the terramorphic to trigger the khalni expeditions and the avenger faster. Otherwise, solid construction :D
The mill is for myself to get everything in the gy that I can