not to shabby my fellow edh playa'

I like your deck a great deal. I have found Greater Good to be a phenomenal draw engine with Omnath. It keeps people from targeting him with removal, allows you to recover from board wipes, and explode more consistently.

My other suggestions include adding a few untap effects. Voyaging Satyr is a solid choice. Argothian Elder + Wirewood Lodge is more elvish and allows you to go infinte with Nythkos and Cradle. I also am partial to Deserted Temple. Good creature untap effects include your choice of Wirewood Symbiote or Quirion Ranger for Rofellos and friends. My omnath deck "Bring out the Gimp" is a little different take on Omnath but may be a useful resource to you.