It si something I am already considering, but the superfreinds part cannot be the whole of a Collected Company deck. But a nice part of it with extra benifits yes. Before I start major deckbuilding I am awaiting more of the set to be spoiled.
I've had the same idea and have been thinking either GB or GW. While Nissa isn't all that agresive, there are enough aggressive gw cards that are better when you hit 5-7 lands that it could work. Warden of the First Tree and Fleecemane. Deathmist Raptor and den protector are other possibilities that don't require a lot of mana, but work better if you have it. GB for Nissa and Lilliana could work very well as a midrange value deck with cards like deathmist, den protector, despoiler of souls, and satyr wayfinder to generate a lot of value. That said, it's still missing a piece to sac for value to flip lili. Something like sakura tribe elder would be insane working towards both walker's flips, burnished heart is a bit expensive, but is the best thing I can think of to fill that role right now. With so many 3s, Elvish Mystic would be a must.