Hi,
first of all, this looks really cool and it's crazy how much work you guys put into it. 
I would love to try it out. I have a few questions though.
Gift of Nature:
Does the first part work on knocked out heroes?

Primal Wrath:
to the second part of the card, this means you get 3 actions each turn, is that right? But why at the beginning of each encounter as well?
Does that mean on my first turn in an encounter I would have 4 actions? What's the point of that?

Primitive Heart:
I find it a bit confusing that it says "revive action" and not something like "revive and adjacent hero", since it does not require an action. I guess you did it, so you won't have to add all that "roll two red dice" part?
Primal Force:
I would probably re-word the first part to "Exhaust this card after you revive a hero, that hero gains 2 rejuvenate tokens", just to keep the wording more
in line with the rest.

Apologies if some of it has already been discussed before, I've only skipped through the thread.

I've been thinking about making a druid as well, since that was my favorite class in my WoW days. after looking at all the spells and abilities, it looked too much of an undertaking to me. so, I didn't do it. you can probably create a druid for each archetype using the different druid specs. But who has the time, right?
Anyway, great job guys!