For Radillo's power to put a spell from the bottom of her deck to the top of her deck (or her hand) after playing an Arcane spell, does this happen before or after she attempts to recharge the spell she is playing?
That is, is the recharge check part of 'playing an arcane spell', or is it something else that occurs only after things triggered by playing the spell (such as Radillo's power) are resolved?
Based on Ezren's ruling in the FAQ I'd say she has to do it before she attempts the recharge check.