In my campaign, the PCs have recently defeated a dragon and looted its hoard. In it, among some other things, they found a fully charged Ring of Three Wishes. Not knowing what it was, the party had their Wizard cast identify on it.
After the game, the player of the Wizard came to me in private and asked if he could use one of the rings uses to wish for the ability to cast all of his spells at will from now on. I told him that he'd have to find out by using the ring and the conversation ended there. I have no reason to suspect that the player was not entirely serious.
Is this something that the spell Wish could theoretically do or is my player just gonna be out of luck when he tries it?