I actually wanted to avoid reading any guides and come up with my own strategies to take down the heroic bosses from the second week onwards but Diablo 3 Season 3 started and I spent most of my time in that game instead! As such, I won't be attempting the heroic bosses from week 2 onwards.
I find that the Class Challenges do offer a clear strategy against 2 of the bosses that they feature. As I played, I realise there do seem to be Epic and Legendary cards that make the bosses easier. They are important to use if you do not want to spend too many tries and time against the bosses. I don't think it is worth the time to challenge this mode with my limited cards but TommyJTheGamer has guides on how to take down the bosses using mostly basic cards on the Hearthstone subreddit.
