Rotating Game Mode Ideas

I was just casually thinking about some rotating game mode ideas, and this crazy one kinda just popped into my head. What if a rotating game mode came out that allowed people to have access to old pre rework champions? Old GP, Old Urgot, Old Graves, Old Poppy, etc.... I believe I speak for many when I say that some of these old champions have a special place in our hearts. I would love to see something like that. What do you guys think?

P.S. Bring back Blackmarket Brawlers! >:)