Kripparrian recently posted a really great video going over the history of Hearthstone card nerfs. I really enjoy this as I played the game in an early state but don't remember much of the game balance so it's nice to get the history of how it's evolved. Interesting to consider the last card nerf was Warsong Commander and not much has been balanced since then. It seems Blizzard favors releasing new cards as a response than nerfing older cards, which I don't mind. I do think some cards should be buffed, but again Blizzard seems against that sort of thing in favor of releasing a new card that work with something less powerful.