So... I just had a brainwave.
Chogath - Top
Malphite - Jungle
Orianna - Mid
Lulu - Support
Ezreal/Twitch - AD Carry
Seems like it would be an amazing teamfight combo, and the champions aren't even that bad individually, some even being considered "top picks" or "OP".
Orianna ults to gather them, Malphite ults in for first knockup, followed by chogath rupture for the second, followed by a lulu ult onto malphite for the third. All whilst chogath's AA's with maxxed spikes are hitting the entire team.
Can't really decide what ADC would go best with this though, maybe EZ for the ult, or twitch for ulted autoattacks passing through units?