So I discovered something that might be potentially strong
Conqueror on 
You might be thinking how and why.
Well here's the thing, when you have some decent AP and
most importantly, and you have Conqueror ready to be used, you ult someone and they will continuely take true damage from Conqueror since the duration is refreshed upon staying in combat and it keeps getting refreshed as long as the Ult is damaging the enemy.
Try going full AP on Mordekaiser with Conqueror and just ult someone and see their health go down due to them taking a big amount of true damage.
As for items, I suggest getting as much Magic Penetration as possible

Who ever decides to try this, have fun Summoners.
[poppy-wink]
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