Riot should do a new gamemode
Riot should add a gamemode which allows you to play with the old champions
example : old katarina , old garen , old talon etc..
with the old summoners rift
thank you (: 
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We looked at doing this recently for a series of internal playtests, because we wanted to experience first-hand whether things like pacing or counterplay felt very different a few years ago. Unfortunately, we weren’t able to easily get the older builds running because so much of the game content and code has changed.