In theory a 100% health Kled would be impossible to kill in a single rotation
So comparing with champions all without items,and the champion that will perform said rotation of damaging spells will be an 1200 AP
,assuming Kled is level 18 and so is Veigar,theoretically because when Kled dismounts he becomes temporarily invincible,it is impossible to one shot a Kled,it also doesn't help that he has an absurd base health but what evs
EDIT:Im not saying he is broken,just kind of funny to think about this randomly while i was showering
Ult + Q or E, wait a sec until Skaarl is gone, E or Q to kill him. Worked for me so far..