I really like how this card has evolved, and it looks great with the new art! I'd go so far as to say this is pretty much Crucible-ready.
I know there's been much debate over the name here buuuuut...with Krava's depiction it no longer really "feels" like a wyvern. I always looked at 'em like fragile little dragon-type thingies, not something that could take out a building. The thought that struck me first: why not Two-Headed Wyrm?
EDIT: I just looked up the wiki article for wyvern. Seems they're kissing cousins to dragons, so I retract my statement. My apologies for stirrin' up mud. Looks good!