"The Equals" Champion Concept?

Thinking we need a champion that can change between a physical damage and Magic damage via ult creatively. (im sure there are some out here but hear my concept) A champion that in one form is "light" and in the other is "dark" Or for different skins can be red or green.

really cool idea for this ranged champ They can have the Ult change you from light form to dark form. Q is a skillshot, with a slow, and physical damage. W gives temporary health regen and range If you take damage within 3 seconds of skill activation you get x% of lifesteal for 8 seconds.. E gives you vision around you and if there is a champion (enemy only), attack speed and movespeed scaling with the E's rank. R changes you to the other form where Q is a channeled Short range lazer. (think of luxs ult but shorter) with A slow and magic damage. W gives temporary range and magic resist and if you take damage within 3 seconds of activation you gain x% of spell vamp for 8 seconds. E gives you vision and if there is a champ (friendly or enemy) then some AP. Passive could be one form has Certain % Armor Pen or magic pen based on how long theyve been in the form for. (They would have to cap this at like 2% Max to prevent early game stuff being broken) So light form could get 2% armor pen for being in that form for like 6+ minutes while if you switch to dark form you lose that bonus after 3 seconds and then slowly start to gain magic pen. The idea to be able to utilize both forms (even in quick succession in team fights) or to have a huge amount of Champion's kit utilization is an idea that id love. use your imagination on this one and lemme know what you think. Maybe different spell effects?