New Game Mode: The Old Revived

I was just wondering Rito, but I am starting to miss old champions. I'm talking about the fact that we will never get a chance to play the old style champs again. I'm talking about champs like Yi, Kass, Sion, Xerath, and other champs that have changed drastically. I know nothing about computers so sorry if I use the wrong terminology, but you guys cannot have deleted everything about the old champs, right? You guys didn't just delete everything about the old champs right? You guys have to have their old skill sets sitting around gathering dust in the back of the memory right? It would be awesome if we could get a limited time game mode where the old champs can be played once again. And to make things even more nostalgic, have their old visuals be used too. Of course there are people who like the new champs more, so make an option for the limited game mode to either play the newer or older version of the champ. This would be heaven. I really miss getting Pentas with AP Yi, the Life Steal Monster Sion, the Extremely Long Range Xerath with an awesome ult and stun. Maybe Kass is too OP then, but it's something that has to be put back in just because you guys would be bringing back the old. I really am starting to miss the old champs though.