For various reasons, I've been thinking of a move that lets you 'borrow' a move from another playbook. My intention is that this is for a character-type who's kind of a mentor - powerful and wise but time is catching up with you, and this move shows that they learned damn near everything back in the day but it's just not as easy, you know?
My original idea was to have them roll to take a move from another PC's playbook, and if it was a weak hit or failure then there's some kind of drawback or penalty - not as young as you used to be/long time since you had that job/etc.
But it sounds complicated and not very fun. The quicker and dirtier way is to, at the start of the session, pick a move from the PC you have the highest Hx with (player's choice to break ties). But that might be a little... bland, it really doesn't have the Achilles's heel I imagine this character would have.
Thoughts, folks?