Yes, another topic about Wit's End
Still brainstorming on how to make this thing a pretty reasonable pick. How about component items? Everyone likes component items.
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Grants 30% IAS, 40 magic resist, and-
UNIQUE passive - Witless: Your basic attacks deal 40 magic damage and grant you 5 magic resist. The magic resist stacks up to five times for a maximum of 25 bonus resist.
This guy would in turn be combined with another
to be upgraded into one of two final items.
Madred's Bloodrazor Grants 60% IAS, 65 magic resist, and- UNIQUE passive - Witless: Your basic attack deal 60 bonus magic damage plus (percentage) of the target's missing HP OnHit.
Or
Kitae's Bloodrazor Grants 60% IAS, 65 magic resist, and- UNIQUE passive - Witless: Your basic attacks deal 60 bonus magic damage and shred (percentage) of the target's magic resist OnHit. The magic resist shred stacks up to five times.
So you've got two options here. One would be more attractive to champs without much magic damage in their kit while the other would be great for dealing with hard targets on champions who do have plenty of magic damage in their kits. Because both passives share the same unique name, they wouldn't stack with each other. Ideally, after you buy one you shouldn't even be able to pick up another. I think both of these items would rather nicely fill in the gaps for champs who have a hankering for some extra magical oomph. Both of them are designed to 'ramp up' in more or less the same way Wit's does already, though they both do so in different ways.