A.R.M.I

I just came up with an idea for a new game mode. It's called ARMI and it stands for All Random Mirrored Image. It's played on summoner's rift, and the idea is that it's two random top laners, a random mid laner, and two random bot laners. Both teams have the same 5 champs, and it's up to the skill of the player to win the game rather than just having better team comps. I don't have many details about the idea as it just came to me like 15 seconds ago, but it's something that I would want to play if it was an option. I would love to see how mechanically skilled I am against someone who is playing against me as the same champion. Thoughts? Would anyone like to add things to this idea? Are there any issues with this idea?

BTW this is my first post on rito forums so pls go ez.