I've acquired several CollectaCards in my time playing Theathrhythm. Sometimes, I'll go check them out and read the neat little quotes in the Museum.
One thing that's piqued my interest is that these cards seem to have levels of some kind. For instance, my Warrior of Light card is Lv. 3, while my Cloud card is Lv. 1. Both of these cards are Normal.
What does this information tell me?