Luden's Echo + Karthus
I'm not a fan of the new Luden's Echo since not many champions can spam spells to charge it really fast. ADC can charge there shyv by building AS and it does more damage with crit.
But then after some thought I realized this item with Karthus must be really good. Since his Q is the shortest CD spell.
But how would Luden's echo passive work with his ult since he hits all targets at the same time? If it procs on all targets that is pretty broken is some sense