Only the greatest CCG ever created by man.
STAR WARSNot the one based off of the Prequels but the Decipher release of the original movies from 1994/5. It's been discontinued since (I want to say) 2000. But its still by far the most expansive and in depth game. You can still get the expanded rules (competition) which is a whopping 108 pages and pick through that to use what rules you want to (although the organization that wrote the rules frowns upon it; but if you aren't competing who cares.)
I see them on Ebay all the time for sale, be forewarned though, since it is no longer produced expect to pay a premium for even common cards. I stopped playing the game around 1997 and kept most of my cards...although I sold off a lot of the rares at that time to repair my car which, in retrospect was really stupid.
I had recently tried to teach my step-son how to play the game but since I've been out of it for so long the new rules were a bit confusing to me.
One of the coolest aspects of this game is that you can build low level decks with nothing but Stormtroopers and Rebel Troopers and kick ass against high powered decks that have a lot of rare character cards; ie: Vader, Leia, Han, Chewie, Solo.... as long as you put multiplying cards in, most officer cards will add power and defense to low power characters and some even allow you to deploy additional characters for free.
Man, I'm gonna dig my cards out this weekend and get a game going with my son.