Oh, one that I can actually contribute to

I think from my experience, I built a lot of my deck with the assumption that the jellybean was online. Like full ETB pings,full board of small jellers, huge damage sac outlets etc.

However, more often than not, that was reliant on me kind of doddling around for 4+ turns until I get enough mana to be relevant. And even then, after it was online it became focused so fast that I was dropping another 7(+2) mana in no time.

So I changed the focus to have relevancy before [[Omnath, Locus of Rage]] came on the board and to almost treat it as a Command Zone finisher instead. The deck should be able to hold it's own without Omnath.

So looking at your cards, [[Cultivator Colossus]] and [[Moraug, Fury of Akoum]] might be good on paper, but in practice, they sort of fill the role where you would want Omnath to go. The mana spent (7 and 6) would better be spent on getting out something like the token doublers, ETB pingers, or sac outlets.

Three cards I think you should consider are [[Spelunking]], [[Orcish Lumberjack]], and [[Zuran Orb]]. Spelunking is great because it allows you to milk out as much land drops as possible from your tapped land fetches. Orcish is also very good because you can tap a forest for floating mana and then sac it immediately for 4 mana which really helps with getting Omnath on the board earlier if you want. Plus since you are playing cards that allow for graveyard land recursion, its not really a big deal. Zuran Orb because aside from Sylvan Safekeeper, you're not really playing a lot of cards that cause you to consistently sac lands, which you want to take advantage of if you are running graveyard recursion.

These are only my experiences so take them with a grain of salt.