YOU CANNOT ESCAPE
Infinite dark binding machinegun!!!
I would have to go with the Mantheon leap (non ult) would be funny I guess.
Either that or Varus's piercing arrow.
Veigar's Q. Infinite AP.
Flim and Flam
Since AP Master Yi's huge damage relies on his ult refreshing his Q cooldown for max spammability and untargetableness, I'd say Yi's Q. Untargetable and nearly 700-1200 dmg each Alpha Strike.
Or Ezreal's flash
olaf's reckless swing, TTTTTTRRRRRRUUUUUUUEEEEEEE DAMAGE FOREVER
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