Looks very good. Poosibel things to consider maybe a leyline of sanctity in there, and personally i'd throw in some white knights and knight exemplar to replace the lone missionaries and kor slingers.
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Damn fine idea my only real advice would be to lose some of the big Eldrazi. Theya re legendary creatures so a max of 2 per Eldrazi is more than enough. maybe add in some slightly less impressive but still very powerful green mobs maybe a khalni hydra or a protean hydra. possibly throw in a couple of eldrazi conscription and have fun killing your foe with an elvish piper :p Also with the amount of eldrazi / big creatures in the deck maybe fauna shaman arent as needed possibly some overgrown battlements for the extra mana as they would sync well with your walls of frost as well as being available on turn 2. final point why have garruck in there? with the speed you could get those eldrazi out your planeswalker wouldnt get a look in. Just my opinions but I love Eldrazi and am a big fan check out my deck and let me knwo what u think. http://www.mtgvault.com/ViewDeck.aspx?DeckID=78995
Personally I'd remove the Kozilek's predators and the nest invaders in favour of 3 overgrown battlements and3 wall of vines then add in a Kozilek the butcher of truth and a eldrazi conscription. Doing it that way will allow you more mana more reliably and much quicker access to your big guns.
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