My idea was that with having to remember all of his Destructive/Supportive abilities it would be too hard to also remember two separate game-changing ults, so my idea was that he gets this ult at level 10 with the choice of 2 different self buffs on cast (maybe Armor or CDR for a few seconds) that way his allies and enemies don't have to play around/with whatever ult he picks in addition to 6 abilities.

I really really love this concept, one thing I think would be cooler would be if seasons were global (I believe it also makes more sense that way) and the season effects work in the area between trees (changing grove of life's effect to damage at fall). I also think trees should be destructible, it can be a high amount like 5 basic attacks or something, but it still shouldnt be permanent).

I really like your idea, kinda reminds me of my own design for Khadgar with all the spellslinging and whatnot. I do like the design of this Khadgar very much as a ranged assassin, one thing that does bother me though are his heroics - they all seem underwhelming (slow or silence, nothing flashy), while I do understand the idea behind making his ult simple I do believe making flasher would be better (perhaps losing all mana costs and becoming unstoppable for a duration or firing an endless...

Both Resurrect and Mass Rez are incredibly overpowered (Auriel). That combined with incredibly potent healing (10 mana for 260 health per sec is ISNANE! compare that to Uthers 80 mana for a 360 heal (and that one also has a cooldown of 12 sec)) AND mobility make Mercy's kit incredibly overloaded and in my opinion probably the stronger than any other hero in HotS. My fix ideas: Make both Resurrect and Mas Rez temporary! killing the ally returned with Resurrect after 4 seconds will leave...