Champion with changeable synergies - Qiyana

I was just thinking it would be cool to have a champion that is able to change their synergy, so i quickly brainstormed this:

(5 cost) Qiyana - Wild + Elementalist (<--Might be too much, but it just made sense) between rounds she can choose an element, but loses other elemental buffs (additional synergies) when she does. -Wall: Becomes Blademaster -River: Becomes Sorcerer -Brush: Becomes Assassin Active ability: Basically her Q, functions like Akali's ability (single target, fairly low cost, perhaps a bit more than Akali) bonus effect based on element: -Wall: small/moderate attack speed buff -River: roots -Brush: brief re-stealth (perhaps bonus on-hit damage or a crit on next attack?)