Looks really balanced. Check out my Standard Assassins Deck. Get everything to have deathtouch and finish of with flying creatures. It can neutralize +1/+0 and +0/+1.
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You have very ambitious creatures. Check out my 5 color deck "Victory Beyond the Grave." I think you are trying to do too much with this deck. This will definitely slow down whatever you want to do. You need fetch cards and be able to bring them on the board quickly.
Please comment and offer suggestions.