Ring of Spell Recall

Can only be attuned to by a caster. It allows the user once per day to copy and store any spell they have just seen cast, as long as they too meet the requirements to cast that spell. The spell can then be recast without using a spell slot at any later point. Only one spell can be stored at a time and it does not leave the ring until another spell replaces it or the user deletes it. The copy and store ability recharges daily at dawn.