We could discuss the health of the game regarding alterations of cards, if we were talking about a nerf. Although, I would also be very against it. The balance can be achieved by printing other cards that fight it.

Even if you consider it special because it is designed by whoever spent the most on the pre sale, it's still just a card like any other from the core set. Sure, the name and maybe a few other things (I don't know exactly what because I never participated in the process) get designed by the person/group but it's still a card from the core set that you can open on packs, just not right as the set launches.

A bad card doesn't hurt a TCG, even if it's supposed to be special. Sure, people might be annoyed but not to the same degree a very OP card affects the meta. That's the biggest thing about this. Resources were spent for something that, at best, was totally unnecessary.

I didn't listen to the podcast so I don't know what was said but in Tavern some people said that it had been hinted at in the podcast. Regardless, the most important thing about the ethical aspect is that as soon as the team starts working on a buff, anyone with that knowledge can take advantage of this information and it is impossible to stop abuse.

And there's obviously the economic and gameplay aspects. Anyone who owned the card got benefitted, anyone who didn't and buys it now or faces it is losing out. Anyone with other dragon summoners loses out. And I already noticed that the meta is worse now because any big mana game where dragon is available, Nidhoggr is the best choice. Before, people had to choose between Akane and getting access to the big dragon monsters or Tofu/Lorkus and get better abilities but not use those strong monsters. Now they just pick the best abilities and have the big monsters.