i sold my staff of magnus after i completed the mages guild only to find out i was going to need it for a side quest to close a rupture. Is there any way that i can send my xbox character to a PC user and have someone spawn me a staff of magnus?

can you access the console on xbox (no idea really, me = pc only)? if yes, "player.additem 35369,1" should do the trick

Transferring PC user content to consoles is a discussion we do not permit.