Old style newstyle Abilities for champions.

I've been playing League for a while now and I have always wished that I could use the abilities that aren't available for champions anymore. Example. Old ability Soraka, Sion Sona etc. Different play styles options... This would probably make the game unbalanced but I also think that it would give you more play options. That way your match up has to think a little more about who he/she is playing against and how to defeat you.

Just wondering if anyone thought about this? Imagine, I'm going old style Soraka! Other player - SWEET, love that mana regain ability old style Soraka has and that passive with the -MR. But yes, I think this would be a type of MODE attachment and I think it should be implemented into the game for more options on champions... as if there weren't a lot already. Would still be cool.