An Idea for ARURF

Not getting the champ you want isn't fun. But always having the broken urf champs every game isn't fun either. I think that for every 5-7 games of ARURF you get one game where you can choose ur champ in urf. You can only have one available game at one time. In other words, you can't play 10 games consecutively and get 2 games free in a row.