I tried all human/elf fighter/rogue combinations, and the only one I could defeat the dragon with was elf fighter. Even as the ultimate deckbuilding dungeon crawl champion I felt like the game was challenging enough right now with that configuration, I battled that dragon for a good 15-odd minutes in a very dramatic fight with many close moments.
I'd say the other classes could use some balancing though (or maybe they just don't align with my strategy?), especially in the way of healing items: Playing without something like bedrolls was pretty harsh. Other than that, I liked the new way of distributing the cards, that added a bit of a challenge to buying things. Good additions!