User blog comment:VeiRetning/What UR Cards are worthy for Mirror Maiden?/@comment-25763904-20170412115037/@comment-29974411-20170412123157

I am a mostly free player too, bought about 2-3 buildings only so far but may want to summon on a Perfect Event(In which most cards in that event is fantastic) so I totally understand. The Mirror Maidens I have, I am also mainly saving them for the event I planning to Rank decently, preferably also to use them only when it's a Box Summon(Since Step Up is much cheaper) to maximize the value, unless I hit jackpot and got IXTab from the Guaranteed UR Summon, then Mirror Maiden will go to her :)

Using the MM UR for cards that lets us be more competitive is definitely a very worthy reason to Mirror Maiden a UR especially if it gives a big upgrade and competitive edge. I will include that in my list. Thanks!