Ah the glory days of the CCG. What ever did I play?
MtG, L5R, Wyvern (shocking), Shadowrun, AvP, Battletech, Doomtown Doomtown Doomtown, Star Wars (Decipher - until somewhere around Endor...), Star Trek (also decipher. Ironically indecipherable), WWE Raw Deal, Rage, Young Jedi (terrible), WH40k CCG.
I played Star Wars and Doomtown the most I think.
But the best games have to be Netrunner (have picked up new edition, just not played it yet), and Babylon 5 - Best 5+ player CCG around.
Of course, I layer a Human Babylon 5 Peace deck - suddenly people realised what I was doing and rushed to start a bloody war.
Next game I brought the League of Non Aligned Worlds. Much like the real UNIT, I pretty must just screwed up everyone else's plans all day.
(Note of caution - a "quick" game of B5 was at least four hours)