Are there any libre card games?
I don't mean gambling games (like Poker) or even those that can be played with a standard deck (like дура́к) I mean something like Magic the Gathering or Coup or any of these... let's say "specialized deck" type of games. You know, the sort with cute girls and autistic mechanics. It could be a Trading Card Game, but I'm not hopeful any of those got a free implementation since their entire point is to milk players for money, and I want something I can host on my server to play with friends. Could be 1v1 or any sort of group matches.
If there are none, I'm also taking suggestions for something I can implement myself. The only constraint I want is a reasonably limited set of cards because I don't want to have to put 1000 different cards with different behavior in one game, so pretty much every TCG is out of the question.