Very nice! A lot of green good stuff in here
Hydra Omnivore is amazing.
Kavu Predator can be amazing depending on your playgroup too. I love seeing modal cards in here too, they can be so useful. At first I wasn't sure about the flying mode of
Frontier Siege, but then I remembered your flyers mostly had death touch, which is actually a really neat combo for constant creature removal.
Scute Mob can be a total beast.
I'm not too sure if
Havenwood Battleground's sacrifice ability will come in handy often, I'm not sure if it's worth the tempo loss. I'm guessing that
Expedition Map is in here to find Nykthos.
Sylvan Scrying would be the same thing, but at sorcery speed for one less mana, so it's up to you.
Very nice deck-great job working with this!