Just thought I might say something here: this deck is extremely weak to fast creature ramp. I tested this against multiple decks 2 out of 3. (I might have been playing this deck wrong, though. I tried to be fair)

The most noteworthy of the decks I tried it against was Elves Everywhere!!!

While this is my own deck, I promise I wasn't being unfair. Try it for yourself (I will also concede that Elves Everywhere!!! costs nearly 5 times as much as this deck, but the point stands. This deck is slow. Maybe sideboard some quicker spells, more mana-producing creatures, or possibly some black mana and a Corpsejack Menace . That combo is extremely vicious, and while it may be a little expensive, it will be well worth the investment)

Oh. And also, since this deck has much more green than white influence, Essence Warden is far better than Soul's Attendant for this deck. It's ability is also mandatory, so if you forget, you can go back.

piggy backing off SteelNinja, you can also consider Soul Warden

I'd consider adding a few more mana dorks and subtracting a few lands. While this deck needs a lot of land, I was getting inundated by too much of it that I couldn't even put on the board when I did some playtesting this morning.