Don't you dare forget about Veigar

Infinite ap from a 2 second spell means the most potential scaling.

A Jarvan stun orgy where you either throw away your 5 minute flash or eat 2000 damage.

An ult with counter play similar to that of a Rengar ult

And please don't say bull about how you can shut him down or he's hard to play. This thing can work support and still one shot your sorry adc. The most frustrating thing of all is that he has no counterplay, even though he's worthless. Don't gut him or anything but at leave make his ap harder to stack or something.