Pro Play Mirror Match!

Just throwing this out there only because I had the idea come to mind earlier today and am not aware if there's any discussion on it yet. I'm almost certain that this has never been covered in the professional scene, maybe in team scrims perhaps, or custom games.

I would really like to see professional teams duke it out on the Rift in a 5v5 mirror match. Lane matchups with the same exact champs to see who can outplay whom. I'm aware of game modes like one for all being played in All-Stars, but I think this would be a really fun game to watch, especially for teams with huge fan-backings like TSM vs. IMT to see who is more dominant. No bans, lottery-style picks within each role where both players have a pick and it's 50/50 from there on. Rather than macro play, it'd be more on whose micro is better.