Thematic Adds:
[[Greater Good]] would be something I'd try to get in asap. It gives you another sac outlet. I'd consider throwing in Alter of Dementia as well, just to help make sure you get an outlet, though the mill isnt great.
I dont think mana is going to be an issue in this deck, cause lands, land ramp and mana rocks are all stocked up, but if you want more, [[Jaheria friend of the forest]]
[[Song of the Worldsoul]] helps with your populate gameplan, and if you want more tokens made, [[Academy Manufactor]] cause the golems are food
Second Harvest and March of Progress can be fun mass token makers.
Obviously, any of the token doublers are good, but they're $20-40 so depends on how much you want to invest in.
Removal/Protection seems a little light, but that depends on how you want to play. I'd probably try to get Beast within for a catchall removal, another counterspell or 2 and a board wipe like Hour of Reckoning to keep your tokens