New game mode idea

I like playing league, but sometimes the competitive aspect can really put me in a bad mood after a tough loss. This got me thinking of some kind of cooperative mode that wasn't summoners rift vs bots. I had the idea of taking your favorite champion into a dungeon with other players on their favorite champions to earn skins and emotes for their champions to use on summoners rift. I realize this would be a big project but we've been playing on the same map for like a decade. owch