Imagine AP version of Black Cleaver is added to the game. Who's the most broken champion?

+ +1350 g = 3000g 60 AP 20% CDR 400 HP

UNIQUE: Dealing magic damage to an enemy champion Cleaves them, reducing their MR by 4% for 6 seconds, stacking up to 6 times for a maximum of 24%. UNIQUE – RAGE: Dealing magic damage grants 20 movement speed for 2 seconds. Assists on Cleaved enemy champions or kills on any unit grant 60 movement speed for 2 seconds instead. This movement speed bonus is halved for ranged champions.