Out of curiosity, does anyone here know if Sebastian's card game has a real-world counterpart? I.e., was it based off of another popular card game? I can't even remember the name of the game in-universe right now, but I'd believe the in-universe name is basically fictitious, so hopefully it's not relevant. I remember playing the game with Sebastian being lots of fun (even if I lost terribly), so I'd like to find if it has an established ruleset and whatnot.