One neat but somewhat cheesy thing I did with my Omnath deck was to abuse Primal Surge. It's not difficult at all to cast in most situations and if you cut back on the non-permanents, you can play your entire deck, save like 10 cards.

I actually had Primal Surge in this but it was not well received by my play group lol

Cleaned up the comments and update sections! I have added in Khalni Hydra, Vigor, and Garruk Wildspeaker for some extra fun!

I'm seeing a good amount of green devotion here with all the double green+ mana costs here and Nykthos, Shrine to Nyx and Karametra's Acolyte, but I'm not seeing reliability on getting them out. I would add Worldly Tutor and Sylvan Scrying at the very least in order to increase their frequency. I would also put in Primalcrux to feed devotion and to be a big creature.

You have a decent amount of land-based effects here, and I would recommend Boundless Realms to take advantage of it.

Lastly, Doubling Cube is a huge asset to Omnath and makes casting your creatures easier, especially considering over half of your creature base (29/41) is CMC 4+.

Thank you for the advice! I definitely agree there needs to be a couple more tutors in the deck. I usually rely on Lurking Predators, See the Unwritten, and others like them to get additional creatures out, but it would help to have one or two more.

I have thought about getting Boundless Realms and Doubling Cube but at this point I am running out of things that I want to take out. What would you suggest I look into replacing the new cards with?

I would take out Akroma's Memorial and Cryptolith Rite for similar reasons.

Rite is great in a deck where you have lots of cheap creatures in large quantities. The quantity of creatures is there, but they are too expensive to justify having your creatures be mana dorks. Llanowar Elves and variants should be fine.

Memorial also good in a deck that uses rite, ones that have lots of small and cheap creatures. But here it does nothing or is win-more. You either cast it and the effect is useless due to the sheer number of anti-flying tech here or you have no creatures left to attack with. On the flip side however, if you're in a position to swing and kill everyone else, the memorial is overkill.

I think you are right about Rite especially seeing as how I almost never get it out anyway. I will look at taking it out!

But I have Memorial there because I play casually against a lot of red/black spot removal decks and am the only person who consistently plays green. The protection of red/black has proved invaluable on numerous occasions. It is also there to combat the flying attacks when I can't pull cards like Hornet Queen or Whirlwind.

I just acquired Birthing Pod which I think I will put in here in lieu of Rite. It is not the best tutor, but I can't afford Worldly Tutor at this time. Good news is that I get to put the creature on the battlefield.