Make Wit's a component item
For anyone who has been around for a while, Wit's End used to be a 2kish item that served as a nice mid-game rush for a lot of tanky-derps but it didn't steal magic resist. The new version was create which, while nice, is a bit too expensive to be a rush item, but not expensive enough to be a core offensive item.
So to that end, I propose splitting it.
Wit's End now builds out of
and sits at 2k gold. It would still have the stacking MR buff, but it wouldn't steal resist.
A new item would be added that builds out of
that grants much higher attack speed, stronger OnHit magic damage, and a significantly buffed Magic Resist stealing mechanic.
Thus, this new item would serve as a direct analog to Hexdrinker/Maw. A nice cost effective rush item with the option to upgrade into a more potent version of it later in the game.
+ 
. Just give it some crit and marksmen will pick it up over
when they have more ap on their team than usual. With games getting shorter, even if you intend on taking it as a marksmen to help, by the time you finish your core the game is over.