For me, one of the stranger idea introduced in Radiant Dawn was arcane cards. I felt there were poorly implemented in the game due to few non magical characters in the game having a high enough magic stat to use it properly. In addition to the 1-2 range, and low which made it difficult to use. If it were going to be in up coming Fire Emblem game, it can benefit hybrid classes the most. Perhaps it can have different properties such as debuffing, or lower movement?