Flamewaker without Mana Wyrm, Mad Scientist, Dr. Boom, Firelands Portal, Ice Lance, Yogg, or Aluneth is probably a very different deck. I'm not sure Mana Cyclone is a great substitute for stuff like that, even in this slower overall meta.
I could see Kun being very annoying. It'd be totally fine except quest makes it give 10 armor on top of it being a late game 0 mana 7/7.
Avenge and Call of the Wild might be intimidating as well, but probably not as frustrating as Kun.