to be able to put up to 4 wizards into (suspended animation) and switch them to and from (or swap) to your current list (of 6 possible wizards)
but have it have a cooldown also, like once a week they can do this (put one into retirement or pull one out)
another thing, you can't like use them to bank store, but what ever that are waring when you "save" that wizard would be moved to it
likegear or in the event you have a Mega Gift Card house, all this would freeze in place and what not and you could make a new wizard without destroying your work or untradable house, or just simply to create that 7th wizard abd retain you long worked on wizard
(i can roll one in less then 2 weeks and fully gear it, but not everyone can do that, why i am thinking of the casual player here)