Hearthpwn

Yep needs a lot more draw.  runs out of stuff to do fast

I had fun playing this during the set's honeymoon period. :)

Honestly, Fel Summoner keeps feeling like a not-good play whenever it comes around to turn 6. There anything else that would work better than her? One card draw, and one more big demon?

Someone else mentioned that the deck might need more card draw, maybe swap her out for Skull of Gul'dan and/or Spectral Sight? In terms of other big Demons, there aren't really that many crazy ones. The best next options would probably be between a Priestess of Fury or Ancient Void Hound. The rest either aren't impactful or defensive enough to warrant running.

This deck needs card draw badly. You run out of demons so quickly. 

Your best bet would be to probably swap something out for Skull of Gul'dan and/or Spectral Sight. You could play around with the Fel package to see if something works better in terms of draw, but it is a pretty defensive kit that allows you to have some staying power up until the big turns so I wouldn't favor cutting the entire package out.