I don't understand your land choice due to the fact that you only need blue or green. Phyrexian Soulgorger needs creatures fed to it and there is 8 creatures including itself? If I read this correctly you have a 62 card deck but there are duplicates of Darksteel Citadel. Might drop the snow/artifact focus and go with one or the other. I see what your trying to do, but you need a focus in order for it to work.
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Mortal Combat seems out of place, especially with only 14 creatures in your deck. Other than that, pretty ugly. I like the mill/discard. Please check out my Trample Swarm and see if you can add anything to it. Thanks!
Very nice, I've made a similar deck, but I don't have enough of the rares yet. This is essentially the idea behind mine. Well done. Also please check "Attack of the Z" and comment. Thanks
What about a Rancor or Ancestral Mask. They wouldn't mess up the mana curve and would be amazing additions to either give that big guy trample or +1 for each enchantment.
Drowner Initiates and Memory Sluice might help mill a little more. A great combo I use in my wizard mill. I'll try to post that here later.
Shield of the Oversoul seems a little out of place since you have no green/white creatures. I would drop those two for 1 more Eternal Witness and 1 more Yavimaya Enchantress to make 4 of each. I understand this hurts the enchantment theme, but it supports them by bringing them back or another big one thanks to Enchanted Evening.
More of a Goblin/Rogue deck. Also you have 17 more red spells than black, might consider mana balancing or non basic lands to even that out