I would definitely make room for Kiln Fiend in this deck. I feel like its just an elite threat in this sort of shell. Also, you'll probably want to pick up Swiftwater Cliffs, as running a strictly-basics manabase can lead to some awkward hands. Some cantrips (Preordain, etc) would help you find your combo pieces as well
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Needs moar Skred
Snow-Covered Mountain, Skred, & Scrying Sheets are modern-legal. Coldsnap, br0
What about Orzhov Charm instead of Boros Charm or Crackling Doom
Hadn't thought of using Dark-Dwellers in a Shadow deck. Seems like a cool idea. Hows that card been in testing?
Why not go Snow-Covered Mountains to afford your deck a great 1-CMC removal spell in Skred?