An oft-overlooked card that is great in devotion, is Predator Ooze. Resilient to everything short of Path to Exile and the occasional Dismember, it gets big and scary fast. It could replace 1-2 copies of Polukranos, World Eater, since Poly is legendary and costs 1 more mana. And If I were you, I would replace the Kalonian Tuskers with Avatar of the Resolute-- Same power, same devotion, but with trample and the potential for +1/+1 counters. Strangleroot Geist is also really good and fairly cheap. Finally, maybe find room for 2x Soul of the Harvest-- resilient to Bolt, Abrupt Decay, and Inquisition of Kozilek, tramples over chump blockers, and nets you value on your creatures. Not to mention fairly cheap irl.

Wow, thanks so much! I feel stupid for missing Avatar of the Resolute :P. Any suggestions for sideboard or opinions of my maybeboard?

For the sideboard, maybe pull 2 Display of Dominance for 2 Autumn's Veil. You've also got room for Pit Fight/Prey Upon against decks that have too many early-game blockers. Let's see... Oh, graveyard hate is practically a must-have. You could sideboard Relic of Progenitus, it's effective but cheap (CMC and irl). As for the maybeboard, Surrak is really good, but you already have a lot of four-drops. Maybe replace Polukranos? Surrak usually winds up having haste, and gives other creatures haste turn after turn, so he's great value. Polukranos's ability usually winds up being too slow in Modern. As for Hornet Queen and Whisperwood, they're both really slow, especially Genesis Hydra topping your curve. Shaman of the Forgotten ways is interesting, but I haven't gotten to play with or around him yet, so I can't say. Best of luck!

Thanks again! I'd say Shaman of Forgotten Ways makes a decent sideboard option against control decks, what do you think?

Also, while Hornet Queen is slow, it grants MAJOR board presence, and it shouldn't be too hard to get out with cards like Nykthos, Shrine to Nyx and Courser of Kruphix.

Unfortunately it's a bit pricy, but Primalcrux would be great.

Yes, that would be perfect for the deck if it wasn't so pricey, but the deck is pretty solid already, don't you think?

I would suggest cutting Blighted Gorge + Blighted Woodland for 4 Rootbound Crag. I understand that you are using Evolving Wilds + Terramorphic Expanse to trigger multiple landfalls but I believe you are better off replacing them with another dual lands like Cinder Glade or Temple of Abandon since your creatures will do that for you. The hit you take from being behind on mana will lose you the game. You are missing one of the best landfall creatures from BFZ, Undergrowth Champion. You could probably cut 2 lands and replace them with Domri Rade since he allows you to draw your creatures. Also, you could replace Animist's Awakening with Cultivate.

Wow, can't believe I missed Undergrowth Champion XD. Thanks for your suggestions! I'll make some changes soon :)

No problem. I also want to suggest Grove Rumbler instead of Makindi Sliderunner since he fills the gap you have between 3cmc and 6cmc. He is also an elemental so that's a plus.