I have a mono-green deck, too: Legit Mono-Green Burn (Is That Even Possible?). You should check it out.

After looking through this, there are a few cards that seem kinda pointless in the deck. i would recommend not using Omnath, Locus of Mana since he doesn't actually give unlimited mana. Also the elves that you use that untap lands i would probably recommend mana creatures such as Elvish Mystic and so forth. Yeva, Nature's Herald also isn't that great. A friend of mine used to use her, and he never really had any benefits at all for his creatures gaining flash.

Also Kalonian Hydra should definitely be in this deck mostly because any of your creatures with +1/+1 counters would get benefits from him since when he attacks, the counters on other attacking creatures are doubled.

I like the thoughts. Kalonian hydra is definitely a house. For me, the elvish mystics are comparable to the arbor elves. Would there be a circumstance where I would prefer one over the other?

Somberwald Sage ?

That's pretty solid.

I would keep Arbor Elf . Imagine halving Utopia Sprawl enchanted on a forest. Tap the enchanted forest for 2 mana, untap it with Arbor Elf , then tap for another 2 mana, for a total of 4 mana. I find that better than tapping an Elvish Mystic for only 1 mana.

Great point!

Look's like a solid Deck but overkill with all those creatures need's support will spell's like atleast maybe 2 Beast Within's or something and cultivate's to speed up the mana drop's and thin the deck but cool deck bro -

Mossbridge Troll and Polukranos, World Eater! Cool deck, +1

Great suggestions! Especially mossbridge troll, I love it!