I've really enjoyed
Reality Ripple. Because you are so creature dense, you probably still don't want board wipes to resolve most of the time, but this can protect against spot removal, while also being an offensive spell. Somebody about to go ham with
Aetherflux Reservoir ? Phase it out!
Insight is another copy of Mystic Remora and Rhystic Study in the right playgroup. Green is a very popular color
I also second the inclusion of the instant/sorcery based ramp spells, probably over some of your mana rocks. They trigger your commander and lands are a lot harder to remove than artifacts.