Here are some of the things I want to see; some may have already been asked for:
Get rid of white saints on purple cards.
Transfers of saints and stars should be separate.
Transfers of saints and stars should switch the saints and stars. It would be a two way transfer, but obviously still lose some stats on both ends. This allows us to make use of some of the saints already on the card we want.
Dismissal of heroes
Redeem card for spirits: 50 for purple and 80 for gold. (makes use of useless or maxed out heroes)
Passive skill tree: Allows for modifications of stats and finally active skill. Points are given for each sanc to distribute, allows us to better personalize our heroes.
Let me know what you think.

