It's a really interesting set-up you have going though. I'd take out the Dark Confidant s, the Boartusk Liege , the Scar , the Duress , the Faithless Looting s, the Blackcleave Cliffs and the Mutavault . and add an extra two Lightning Bolt s, three Blightning s, two Boggart Ram-Gang s, one Vexing Devil to smooth out your mana curve a bit. Then add in an extra two Stomping Ground s and Blood Crypt s if you have the cash.
I really like the deck. It's a nice take on Modern Jund. +1
I'll just leave this here for Lotleth Troll to drool over ;)
Also have you considered Fauna Shaman ?
The deck looks really nice as is, though I think you can really go to town on aggressive creature synergies.
I really like the option for turn 1 Faithless Looting or Inquisition of Kozilek , though not so much Vexing Devil . I think if you take anything out, it should be the Vexing Devil s and Desecration Demon , and maybe 1 Faithless Looting
That's just me though! Hope it helps.