Could you fully restore the 80 Ability Power tier in a mini-5.13 update?
Buff Zhonia's and Rylai's up to 80 Ability Power. Nerf Morellonomicon down to 80 Ability Power where it's always belonged. Now they're all on equal grounds and their utility decides which to buy.
And while you're at it you could buff Athene's up to 50 Ability Power and nerf Ardent Censer down to 50 Ability Power so they form a tier with Zeke's Herald. You've been buffing Ardent Censer ever since you created it, so I doubt its buyers would mind. Again, the utility would decide instead of the Ability Power.
Edit: With Utility I mean other stats, passives, actives, etc.
. Admittedly, some of them are fairly niche. Liandry's can be useful for flat pen, even if no one is stacking health. Void Staff is a staple in mage builds. GLP probably has more general potential than it's given credit for due to the active that gets overlooked due to it being a "mana item"