User blog comment:VeiRetning/What UR Cards are worthy for Mirror Maiden?/@comment-26039274-20170412144218/@comment-26039274-20170413074736

You're welcome! I did not mean to make your list long >< Just wanted to give a "summarized" idea on what skills are worthy to mirror first.

And I forgot to add this on my first comment:
 * Any UR Point Booster at the start of an Event
 * I would like to give an objection to this: Only do so if the UR booster's skill is useful and/or if the RRs are worthy.