This isn't to say that the mighty Cimmerian doesn't have any market clout, he does, but I find it hard to imagine that there is muc CCG appeal here. Imagine the following:
Howard Fan 1: Okay, I tap Conan the Reaver who decides to attack your Juma the Unyielding card.
Howard Fan 2: I "sacrifice" Juma in order to play Conan the Avenger from my hand to intercept your Reaver. I pump his strength with the Thulsa Doom card from the Kull expansion, while increasing the Avenger's strength with the "By This Axe I Rule Card."
Howard Fan 1: But you have forgotten that I had played the "Red Nails" card which prevents you from playing Kull expansion cards during combats.
Howard Fan 2: Ah, but I had played the Ashton card which allows me to ignore all modifying cards if they prevent the play of Atlantean modifiers. This, plus the fact that I had played the Tower of the Elephant location card means that I get to add Juma's strength to the Avenger card because Elephant makes all sacrifices increase the player of Thulsa Doom's character's strength.
Howard Fan 2: Fine. I activate Aquilonian princess, who prevents Juma from being sacrificed because she must be sacrificed instead.
Howard Fan 1: Okay. Who wins. Conan or Conan?
Any time the resolution of a game ends with who is tougher Conan or Conan, I think the playability is a little lacking.
Now if Fantasy Flight were releasing this as an expansion of their Call of Cthulhu card game...that I'd play. How you ask? Well, Clark Ashton Smith, Robert E. Howard, and H.P. Lovecraft used to take elements from each other's writing and add it to their own tales. They had a kind of "shared universe" if you will. That would be interesting, but Conan vs. Conan should only be a conversation referring to the quality of various adaptations (i.e. which Conan movies/comics/RPGs are better).