First off I like the deck idea.Trade empty the pits for Nyx Weaver to synergize with Sidisi. May want some fancy combat tricks. Also bow of Nylea is a good sidebar.
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I like the idea. Shrapnel blast + doom engine is brutal.I would exchange cloudfin for chief engineer since you will have lots of creatures for ramp. Maybe add Keranos as you have no 5 cmc cards?
I love the concept but may I suggest a couple of things. 1. 4 Archetype's is a lot when only 2 creatures don't have death touch. It's also vulnerable to back to nature. Maybe Liliana's Reaver is a nice balance and cmc 2. If you are ramping the caratyid is better due to hexproof and 3 toughness3. I love Agent of the Fates but for full value I would include either gather courage or mortal's resolve for a nasty surprise4. For extra jerkness perhaps add a dictate of erebos so when your chumps die they take out two for one