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I run a similar deck, its pure bw tokens with an exalted twist. I recommend scratching black from your deck, it does nothing really except flash your souls, and between hauntings, centaur tokens, etc i think its excessive. i know sorin has appeal but in reality a mikaeus will get you his second ability for a slight two mana. I only play sorin as an eventuality in the absence of virtue, suggest you do the same Or get red of him. Board in sundering growth against artifacts and enchantments, dryad militant and crypt against grave/control decks, and o-ring against angel of serenity type bs/reanimator. Add sigardas, scratch wayfaring temples theyre too conditional. Put in arbor elves as well for boost. Two more thragtusk if you want to be op...trostani and odric id keep (3 or 4 of each) they give the deck a nice flavor since those cards don't see much play but are solid four drops. now your curve would be a bit higher so farseek or the new avacyn guy that taps for three mana for creature spells could be appropriate. Possibly keep a few gb or wb duals and continue to run souls, but no hard black cards.

good luck