Board Thread:General Discussion/@comment-164.115.134.2-20140310025157/@comment-25469537-20140310064528

It actually includes Arcana and blue stats, the number you see on the right of the cards' respective statistics. If you burn up about 20 Arcana, the stats will increase by 1000. So you should need 2000 of these to upgrade her ATK to at least 16000. Blue stats come along with friendship events and their respective building that increases their DEF and ATK, not forgetting the Auto skill cards that increase Unit ATK by a certain percentage.