Good CCG's that are still in print.?

Looking for a good CCG to play. I've already played WoW TCG, magic, Yu-Gi-Oh, Duel Masters (God I miss it :p), Yu Yu Hakusho...I've been told Chaotic but it just seems rather childish to me (Of course I doubt many people find me mature for still playing these games lol). But I digress, good CCG's...anyone?