Greetings Maplers, In the wake of the v.218 Update, an error was discovered with Red Familiar Cards, where Familiar Potential was not properly being reset. In order to minimze the impact of this issue and make fully resolving it easier, Red Familiar Cards have been removed from the Cash Shop until further notice. We will work to resolve this issue as soon as we are able, and will let you know when they become available again. Thank you, -The MapleStory Team View on the Official Site