I'm a little concern over that "Bone Dragon nerf" actually.
The number of skulls generated isn't always tied to the damage dealt, remember how some people called Sheggra's nerf a boost.
The armor shredding is reduced, that's for sure, and that's nice, but on the other hand, this bone Dragon is capped at 20 skulls. As long as it's enough to get more than 90% chances of getting an extra turn, I'm not sure this reduces its damages / it's scaling when paired with Courage.
Also, you wanted to keep him competitive at low level by adding one skull to the base generation, but this also affects end game, because (currently), when Bone Dragon drives you into a corner, that's often when you don't have any armor for him to combo you anymore, and then skull generation will sometimes backfire against him. More base skull means reducing the chances for it to backfire (also, no changes in his third trait? I mean, this is yet another thing that makes him powerfull, if he is facing you and doesn't match any 4+ skulls, you can't punish him by doing some match 4 yourself unless you are frozen imune...)
Well, this nerf could be enough if Courage's 3rd trait was nerfed too, but that's not happening...