What sort of action is it to put up a clerical or wizard aura? Related, can it only be done during the character's turn? Can the same character put up multiple auras at the same time?
Related feedback:
The luck domain "+2 to all d20 roles" aura power seems fairly powerful to me, since past level 10 or so this may well be every fight in the day. It is less alarming if it is a standard action to put the aura up.