Black Swan was bored and wanted to do something other than predict someone's future, so she left you her cards that she uses to fight or even predict the future, but she forgot to remove one that she never tried.

Black Swan looks at you a little nervous and excited at the same time, since I don't use that letter and it is she who will be used to know what she does. Black Swan: ehm... be nice please, if you want... you can start with my feet, right?