Update: 2-25-14

Almost a year since the last update and I'm sure 8-10 cards have changed.
Specifically, the Eldrazi had to come out due to their trade value.

Any comments would be highly appreciated.
General:
1x Omnath, Locus of Mana

Creature (24)

1x Acidic Slime
1x Avenger of Zendikar
1x Bellowing Tanglewurm
1x Budoka Gardener
1x Eternal Witness
1x Fauna Shaman
1x Fierce Empath
1x Frontier Guide
1x Genesis
1x Kamahl, Fist of Krosa
1x Magus of the Library
1x Omnath, Locus of Mana
1x Oracle of Mul Daya
1x Polukranos, World Eater
1x Sakiko, Mother of Summer
1x Seedborn Muse
1x Silklash Spider
1x Spearbreaker Behemoth
1x Tajuru Preserver
1x Terastodon
1x Thicket Elemental
1x Vorinclex, Voice of Hunger
1x Yavimaya Elder
1x Yeva, Nature's Herald

Artifact (9)

1x Caged Sun
1x Doubling Cube
1x Emerald Medallion
1x Gauntlet of Power
1x Lightning Greaves
1x Seer's Sundial
1x Staff of Nin
1x Vorrac Battlehorns
1x Whispersilk Cloak

Instant (4)

1x Avoid Fate
1x Constant Mists
1x Krosan Grip
1x Momentous Fall

Enchantment (15)

1x Abundance
1x Asceticism
1x Bear Umbra
1x Bow of Nylea
1x Burgeoning
1x Exploration
1x Gaea's Touch
1x Hall of Gemstone
1x Hibernation's End
1x Mana Reflection
1x Night Soil
1x Sylvan Library
1x Tiger Claws
1x Vernal Bloom
1x Vow of Wildness

Sorcery (12)

1x Boundless Realms
1x Calming Verse
1x Genesis Wave
1x Green Sun's Zenith
1x Harmonize
1x Nature's Lore
1x Overwhelming Stampede
1x Praetor's Counsel
1x Primal Command
1x Skyshroud Claim
1x Soul's Majesty
1x Tooth and Nail

Land (34)

29x Forest
1x Mosswort Bridge
1x Oran-Rief, the Vastwood
1x Rogue's Passage
1x Rushwood Grove
1x Tranquil Thicket

Planeswalker (2)

1x Garruk, Primal Hunter
1x Garruk Wildspeaker

Why don't you play Hurrican instead of Windstorm? If you have more life then you can pretty much kill the table with the mana production of this deck? Also you may want some reusable token generators like Ant Queen and Centaur Glade, Jade Mage and Nemata, Grove Guardian to use a lot of mana quickly if Omnath is going to be destroyed. Instead of playing Ancestral Mask and the Vow, you could play Loxodon Warhammer which is slightly better in my opinion because of the trample and the fact it's equipment. Lastly, I know this is aggro, but you may want some ways to destroy permanents like Nevinyrral's Disk, Beast Within, Desert Twister, Spine of Ish Sah etc to deal with major threats.

Updated.

Needs a few more lands, you have 32.
You should have 37, minimum.

Concur cards you could take out for lands.
Tiger Claws
Vorrac Battlehorns
Primal Rage
Constant Mists
Soul Foundry
Burgeoning
Collective Unconscious

Primal Rage is really bad, as is Tiger Claws. The battlehorns are questionable but seem decent, I've never liked Soul Foundry much but it seems ok.

Burgeoning and Constant Mists are excellent excellent cards, I would very much disagree with these cuts. In my experience decks like this can run with a lower land count. Maybe just cut the other 4 for now and see how it goes?

The 32 lands is an experiment. I did have it at 34, but kept getting flooded. I typically have the most mana on the board, so I'm not too worried about it. If it plays poorly, I'll look at moving it back up.

As far as the card recommendations:

Tiger Claws
Vorrac Battlehorns
Primal Rage

With Omnath, trample wins games. Primal Rage is probably the weakest of the three, but it still creates a must-answer situation on the board. Tiger Claws has won me at least half a dozen games because of the flash ability.

Constant Mists
Awesome

Burgeoning
Omnath's ability to store mana makes this even better than in most decks. A turn one Burgeoning typically leads to a 90% win rate.

Soul Foundry
This is an experimental card for this deck, like Mirari. I haven't gotten either one out yet in a game, so I'll see if they work first.

Collective Unconscious
As I think about it, I can see the point. 3-4 creatures in play may not make this effect relevant enough. I'll keep an eye on the next few times I draw it to evaluate it.

Thanks for the comments. Any glaring holes as far as cards I don't have in here?

Try a Mind's Eye over Collective Unconscious your playing Omnath so should be able to use it during each players turn.

Whispersilk Cloak, Sword of Feast and Famine and the other swords over the trample effects aka protection from your blockers color = die.

Burgeoning is nice maybe after one turn but how you going to keep card in your hand maybe try Horn of Greed with it.

I can see constant mist being nice but sac'in lands is no bueno but I can see it's use pair it with crucible of world and other similar effects.

I love Mind's Eye. I just have to evaluate the two decks I have it in to see if they need the effect more than this one.

Horn of Greed seems pretty good. I also saw Well of Knowledge in another deck list, which might add even more advantage given the rampiness.

If I'm using Constant Mists, typically I have ridiculous amounts of mana. This means that I usually don't miss the land, and I should only need to use it once or twice before I kill everyone.

Crucible of Worlds, Sword of Feast and Famine and the other Swords are all too expensive. If I do pick something like that in a trade, I will typically use it as trade bait to get multiple cards.

Rancor and Nature's Will Both good cards that go well In Omnath.

Actually, both recently came out in the last redesign. I felt like I needed more card draw as opposed to trample tech/ramp.

Rancor is so much better than Primal Rage though. Like, orders of magnitude better. especially when it's mainly just Omnath that needs trample here.

Needs more:

Awakening
Patron of the Orochi
Trailblazer's Boots
Nature's Will
Vernal Bloom
Vedalken Orrery
Helix Pinnacle
Temple Bell
Mikokoro, Center of the Sea

I just like to untap 1000x and make Omnath stupidly hugely largely incredibly dumb, and then shoot everybody with a giant Rocket Launcher. But hey, that's just me.

Hmmm:

Awakening - I'm not sure I want to hand this much power to the blue decks out there, but I may be wrong.

Patron of the Orochi - This could work. I'll see if I can trade for one for the next round of alterations.

Trailblazer's Boots - Absolutely true.

Nature's Will - Just cut it, as it wasn't performing nearly well enough

Vernal Bloom - Got it, and love it

Vedalken Orrery - Had to go to a different deck, but if I get more copies it may be back.

Helix Pinnacle - Got it

Temple Bell - Definitely maybe

Mikokoro, Center of the Sea - Only have the one, and my mono-red needs the draw tech more. If I get more, I would have no reason not to add it.

Thanks for the suggestions!

How about New Frontiers? Seems like this would work very well with Seedborn Muse, thin out your deck and allow Omnath to get ridiculous...