An absolute must for Pyromancer decks is usually Call to Mind so once the Ascension is online you can keep bringing back your goodies and using them again. Volt Charge is a good way to put counters on the Ascension, and Time Warp is just nasty once you can copy it.
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I've been playing around with an Infect deck myself. I'd recommend splashing blue for Thrummingbird and Blighted Agent alone. Phyrexian Swarmlord is also not a bad pick.
Kessig Cagebreakers and Hamlet Captain also make good humans from Innistrad, and the former can produce for wolves to interact with the Mayor.
Leaf-Crowned Elder is also a great choice to get your Treefolk on the battlefield for free.
If you're going to go the unblockable/islandwalk route, why not look into Wanderwine Prophets, Summon the School, and Lullmage Mentor? The first gives you possible extra turns, and the others can provide fodder for you to sac to do so. :)
I would remove the Mirror Gallery, as having more than one Doran out isn't really great anyway, and Verdeloth costs so much having more than one of him out isn't worth the space the Mirror Gallery is taking up. For lands, I would add some Murmuring Bosk and some Utopia Sprawl. Also, Leaf-Crowned Elder is able to get most of your Treefolk out for free. I play a Treefolk deck myself, and it's possible to get Doran out on turn 2 (Forest and Utopia Sprawl on turn 1, Doran on turn 2). Then, on turn 3 I usually can drop Indomitable Ancients, which act like a 10/10 with Doran out. Just some ideas to think about.
This looks good, but seems a little lacking in mana, especially for a 64 card deck. I'd recommend trimming it down to 60 and adding some Seaside Citadels in place of your Manaliths. Also, you're going to want some creatures that will always be able to get through, so I'd recommend Jhessian Infiltrator, Aven Squire, and Invisible Stalker. Also, Jhessian Balmgiver is a good add to make sure your creatures gets through. Finally, Knotvine Paladin is an excellent card, as it basically gets double the effect from Exalted creatures.
If you're looking for a combo of creatures, you may want to add some cards that let you search for the pieces of the combo. Green Sun's Zenith, Chord of Calling, and Genesis Wave may suit you well, especially since you will have the mana to spend.