sylvan primordial
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viral drake isn't common. also, add distortion strike over artful dodge, and groundswell is pretty much strictly better than giant growth.
Lose silver myr, and replace it with one more of each of your on color myr. I would lose rusted relic and replace it with more myr battlesphere, cuz you should have craploads of myr, and a 5/5 isn't all that big. Also look at what equipment you want, cuz small creatures like wearing stuff.
Ach! Hans, Run!
Woolly Thoctar Turn 3 thoctar 4TW
You need summoning trap. Its a must in a deck like this.
If lots of land works for you, keep it, however you still only have 11 powerful creatures in a 74 card deck, which is not enough. I'd also try to reduce the card count to 60.
You need more consistency, so get more copies of your good cards. Also, you have a few to many lands. And you need a few more powerful creatures. i recommend hoverguard sweepers or amugaba.
Lose boar umbra, there are other umbras that could be better. I'd use snake umbra, because if you put that on a whispersilk equipped creature or rhox, you automatically draw a card. also, primal bellow is extremely good in mono green decks. Also, if you have allosaurus rider, timbermaw larvae, and primal bellow, replace llanowar elves with something that gets more forests out.
Put in Emrakuls, because it gives you an extra turn. If you cast Emrakul with world at war, you get two turns of huge annihilation.
Lose rakeclaw gargantuan, as powerful creatures shouldn't need first strike. I'd put in mosstodon instead.
How quickly do you usually get an eldrazi out? Also, look at Keeper of Progenitus.