The legendary looks really good for buffadin. I'm not totally sold on the 2 mana dude, like, yeah, he'll see play in the deck if it is good, but will he actually make the deck good? He's still got almost all the weakness that buffs traditionally have, getting ruined by silences, transforms, and return to hand effects. What he does is make it so it's not ruinous to your value if he's hard removed by kill effects, just your tempo. And in theory makes it so you can play less buffs in the deck overall which is pretty okay but still unreliable. And the body is pretty bad itself. Unlike that thou, the legendary plant is just weak to aoe, and only sorta. I think it's slightly awkward since the upside of most (single, obviously gets radically better with every buff on it) buffs on it isn't really quite enough on it's own, although the stegadon one might be. All and all though it seems like a pretty good card. I'm still pessimistic overall, since there's some very awkward questions to answer such as how many buffs (10 buffs feels like way too many, that deck is basically going to crumple to any tech cards and also probably hilariously fail when one don't draw ones buff loving cards and instead is stuck with an unplayable buff hand. But maybe with the new buff lovers, you don't actually need 10 buffs to do the quest before you loose? We'll see.)
Also on the whole the deck feels quite meta dependent? Idk, it's hard for me to imagine the buff deck being good against the three decks with easiest access to kill effects that don't kill, mage, shaman, and rogue. So we'll have to see what percentage of the meta the various decks take. Shaman looks like they are getting a pretty good deal, in that they can take the best of the elemental if they are good or jade and mix and match both together. Elemental jade? Could be a thing. And they will wreck any buff deck incredibly hard with hexes and devolves. Of course their early game is getting hit, so maybe they'll fall a bit. But there's some like, okayish elemental early game. It seems like one could cobble together something from that. Certainly if elemental shaman can't get it up against aggressive decks there's not going to be much hope for any of the quest decks.