I love allies. I don't see why the psychic barriers aren't mana leaks though. Mana leak is less color intensive, less conditional, and the life loss on barrier is fairly insignificant.
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What the hell is this?
I really like the deck, and I never knew about slumbering dragon either for some reason. I think you need more cards to deal with my favorite sideboard card, witchbane orb.
I think you should either focus on acidic slime's land destruction potential or tokens, just because you have expensive cards doesn't make it a good deck. This one has too many objectives. In trying to open up your possibilities, you're going to end up having no clear goal with a hand of 3 plains, an angel of serenity, a druid's deliverance, and 2 conjurer's closets.
Just add 20 swamps and this will be playable. As well as there being much better black removal spells, murder will destroy any creature that can be targeted for 3 cmc.