Champion Abilities Idea. (The ability to manipulate a kit depending on the need)

I had a random idea for a champion to be used accordingly to the flavor/need of the player.

People really enjoy playing champions that are ad as ap and vice versa. I personally really enjoy the ability to go different routes of style on champions to suit my need. I used to play Evelyn all the time simply because I could adjust the build to what I wanted. I could go ap, I could go ad, I could go a tanky build, or I could go the gunblade "I never die" route.

What if a champion had the ability to manipulate there kit to what they wanted. A champion that abilities were based on how they were using there moves. For example, Ice and Fire style. As a player used fire moves his temperature bar would heat up and his fire abilities would be enhanced while effecting his Ice moves differently. His Ice moves would be steam instead and no longer CC but instead work like utility move. Trade offs for choices to gain advantages in different areas. As he used ice moves his fire(not hot any more so they could heal or be used on allies for something) moves would alter for more of a support/utility style on top of the CC.

I'm sure there is many other ideas that could be created from this but for those players that enjoy the ability to manipulate their kit to their style/need would really enjoy a champion with such a style as this.

Hopefully I can spark some Riot lightbulbs for new diverse things to add to league :)