Liege of the Tangle is my first thought, has a strong synergy with Omnath :)

frwtr1968: I've seen Liege of the Tangle around in a lot of Omnath decks, I'll see what I could replace for it. What would you suggest I get rid of/sideboard?

You should definitely take what I say with a grain of salt, but my belief is that its synergy and ramp is more powered than the Ulamog. Yet again, if you notice you get to that kind of mana safely, and already own Ulamog probably best to keep it as the kind of beat down it offers. If that's the case then id say the sandworm enchantment for 8 mana.

Also, one particular card I enjoy for green ramp is harrow, sac already tapped land to get two untapped. if you have extra money or some good trade value cards, Oracle of mul daya is excellent at ramp!

Tempt with VengeanceMultiplayer can turn this card deadly fast

Sorry it took a bit to respond. I was away. I mostly keep Sandwurm Convergence to help with fliers, but I've considered gravity well as a straight replacement. I like Ulamog, he's basically there as a powerhouse to help keep the opponents down and from being aggressive. I may replace him at some point. Thank you for your suggestions.

Gravity Well Sorry

I think this deck would really benefit from Harrow and Boundless Realms.

I have a Harrow somewhere, and I've considered putting it in. It seems nice, and with land elementals I could just sac one of them to deal burn with Omnath and get 2 more elemental lands. The Boundless Realms I don't own nor have much interest in, as I get way more than enough mana/lands just from card draw and the current land tutors I have in there. Thank you though.

+1 FOR GRUUL AND GLORY!

Ramunap Excavator OR Ghost Town FOR EXTRA SMASH!

realBorborygmos I've never even seen Ghost Town and it looks rather cool, might see if I can pick one up at some point, and it has rather decent synergy with Burgeoning. As for Ramunap Excavator, I had planned on getting one as it's basically a Crucible of Worlds and would be rather useful, since I don't have easy access to one. Thank you very much!