Of 27 existing collectible demons, I found 7 to be horrible (effect that discards cards or deals damage to your face + Void Crusher) and 8 excellent ones (assuming your deck has demon synergies).
Even horrible cards can be useful. Your opponent doesn't know what you have and may play around certain things. Also there is Elise (for now)
New Warlock Card - Kabal Trafficker
Poll: What do you think about this card?
What do you think about this card? - Single Choice