Urgin's Nexus and Rakshasa Deathdealer will be added shortly
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My version http://www.mtgvault.com/wildor81/decks/12-cylinder-doom-engine/. I think it has a few more end game options. Shrapnel blast still comes too many times with no artifacts in play. Thinking of adding Ugin's Nexus as a twist to sacrifice to shrapnel blast.
A little all over the place with the sideboard could use some help to refine it. Would like to keep it standard.
Short term a couple trading posts allows you to recycle the Doom Engines. I like the Life's Legacy to restock your hand with the burn spells.
I have a similar deck but I was intentionally trying to stay away from being Red/ White/ Green. I am using Titan of Eternal Fire from Theros to do damage to the Hornets nest. Obvisouly it is much slower than your concept. He gives all human creatures tap deal 1 damage to target creature or player.Also have Pargon of Eternal Wilds and Obelisk of Urd to pump up my creatures.Great idea.
One problem with the theme. Deathtouch only applies to combat damage.702.2b. Any nonzero amount of combat damage assigned to a creature by a source with deathtouch is considered to be lethal damage, regardless of that creature's toughness.
Any ideas would be helpful. Not really familiar with the cards yet.