She's not a treefolk but since Born of the Gods is looming over us, obligatory BotG post warning. Have you considered Karametra, God of Harvests? She combos pretty nicely with Leaf-Crowned Elder, free creatures and lands at the same time. Plus 7/7 With Doran. Just saying.
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It's a Vanilla that is a 10/10 when attacking with Doran!
I vote Yes to Renegade Krasis, Progenitor Mimic, Fog Bank and Kalonian Hydra. That's the only Hydra I vote yes for because the other three won't double the Counters on your other monsters nearly every attack phase when you get Kalonian Hydra on the field.
Personally I think come the release of Born of the Gods there are definitely a couple of cards that could make the Sideboard.Incidentally, have you thought about putting in Kiora, The Crashing Wave into this? At best her Ultimate triggers Evolve on all the creatures you have out, locks down one of their monsters and you have a bit of a land advantage. At Worst she's a shield that takes away the threat a removal card or saves you some Life?