Nah, Death's Shadow is just in there for a cheap blocker, and for one mana it can be a life save when I have low health. It's simply in there to protect me as a last resort if my life gets extremely low.
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If your Using Mono Green, get rid of the Alloy Myr and Quiron Elves, and replace them with Copper Myr. He's 2 mana, instead of 3, and taps for (G). Which is essentially what your using the alloy and elf for. Also, instead of Karn, you might want to try using Garruk wildspeaker to help manaramp (his + ability to untap 2 lands), or the second garruk, for his final (drop X 6/6 wurms where X is the number of lands you control) Great Job tho! Scary indeed lol
Also, my friend plays with a similar deck, he uses distortion strike, and it is DAMN effective. Personally, I'd take out the 2 Cancel, (you already have 5 other counters) and throw in 2 more corrupted consciences. Infect doesn't usually have big creatures for cheap, so why not steal some, and make them work for you? ;)