Okay - now after I looked at your card and saw the dramatic changes (especially to its ability with the +0/+2 passive to all
creatures effect), I think it sounds pretty good.
I think 0+2 to life creatures is too much, no? if it's a passive ability, it would be better if it would be just +1 anyway.. but that's just me.
Technically, even though it's a defensive version of Nightfall/Eclipse, you have to remember that
creatures tend to be very fragile (see Frogs, Forest Spectres, and Leaf Dragons for reference). Since
is about creature-spam and trying to get as many of them out (at least in certain decks), this guy, as he is now, provides a very strong HP boost to all your life creatures to make them that more resistant to Rain of Fires, Plagues, and all sorts of creature control available to other elements.
Also, since it does work like Eclipse, the effect doesn't stack, meaning that if you take one Oak Warrior out on the field, all of the
creatures (that have been damaged previously) will drop back to their original HP, which makes it pretty balanced. Of course, you can spam these guys with Fractal, but that's too inefficient...
I approve now. Now that you 'unlinked' it with Dryads, this card has a more general use, which I appreciate more.