Well, I don't think that is more overpowered than replaying gold cards etc, which is now a leader ability of both Francesca and Emhyr, plus there are cards that do the same.
It's as far as I concerned a rare move as well. Assire is 6 power and 8 provisions, and mostly used for tempo with Roach. I know Muzzle is annoying. But I don't really see the argument here, as long as Francesca can play a gold special card twice. I don't think it's worse than that, just about equally bad.
I'm not sure tbh. I was pretty convinced it could be bad for the game to replay gold cards many times, and made a thread about it. People gave some good counter arguments, but I was still pretty convinced it's not a good thing with alot of gold replays. I made an Emhyr deck, he can now replay a gold NG after his ability changed. I feel this deck is a bit unfair to my opponents. But then again, it's not like I always win, so perhaps it is only overpowered equal to many other overpowered decks.
Point is, I am not sure, but if double Muzzle is overpowered, or Assire, I don't think it is more overpowered than any of those things I've mentioned. 20 point swing. I swing maybe 40 points with Emhyr in a good play, maybe even more.
I think it is an interesting thought, but I think it should be a talk made in context with the other gold replays. I'm not made up on the topic, and more doubt has been put into me, but I'm still more on the side that gold replays is probably not the best thing for the game, and that many gold replays seems to be overpowered and might hurt the game in the long run.