Skycrag

I'm guessing Warhelm is mainly to make a 4/3 overwhelm charge warcry merchant on 4 power when you have a card you don't need. I think I might try that.

Mindfire is a sweet market card that does the same thing as Cloud of Ash 90% of the time for 1/4 the cost.

In my experience Factory Quota isn't worth a market slot: even against durdly control decks with few/no units, I still ended up losing anyway. I think I'd rather have Rally in that slot.

Banner in the market is also pretty suspect in a deck that curves out at 3. Yes, you can technically go up to 6 or 7 for Pyroknight and Vadius, but if you're really using a merchant to fetch a 7th power I doubt you're winning that game. I might try Signal Flare as pseudo fifth Torch in that slot, which seems sweet.