Next champ for rework

Hey!
Since we had a Volibear rework last time, you think...
What other character should get a rework and why?
I think Skarner should get a decent rework because he's over 4000 days without an update or anything.
He is also really rare in current games.
I've heard that supposedly Dr. Mundo is supposed to get a rework and even it is already in progress.