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yo yo yo I likes it, but i got some input: how about a Gelatinous Genesis and a Wurmcalling ? And if you like Yavimaya Hollow as much as i do, you want it in play to save your big critters, so to get it why not add a Sylvan Scrying , a Crop Rotation , and an Expedition Map ? Suddenly you've got a 300% better chance of getting it (or your vastwood) out! other cards i like for this theme: Concordant Crossroads so your big baddies can surprise the heck out of the opponents and drop huges damage a turn early. Instill Energy for the same reason and also useful to untap your elder/rofellos. It's kinda like a one-creature quest for renewal on your turn. And if you like growth, where's Fertile Ground ? Considered Tinder Wall ? it can really accelerate getting biggies out early. Off-topic, but what about Asceticism for regeneration/protection? All in all, I love this idea. If i build EDH, it will also be aorund Omnath. He is just too cool.
There are some other good cards similar to Mana Reflection and Doubling Cube that will help Omnath a lot:
Also you can never go wrong with Rancor in a green deck but especially with Omnath the trample is crucial.