Fun Idea to Tweak Multiple Game Series

It would be really fun in Bo3 or Bo5 series if teams were not allowed to pick any champion that was banned or picked in the previous games. With 126 champions in the game, and 16 total picks per game (10 picks and 6 bans), the champion pool is theoretically deep enough for this to be possible (In a bo5 there would be a maximum theoretical number of champions played of 80).

Just a thought :)