User blog comment:Windindi/The Plot/@comment-4437217-20150430225231/@comment-10227639-20150430233501

IIRC, it's not going to be a direct method, instead having some kind of "achievements"(not sure the actual criteria to earn cards) implemented on the character.

I imagine the next version will be the final one, so Wind could use Molebox Releaser to put all the mugen in one file (and hide the sprite files subsequently).