[{quoted}](name=I Lil kNiGhT I,realm=NA,application-id=3ErqAdtq,discussion-id=oI5EL5Ku,comment-id=0002,timestamp=2017-05-08T02:37:01.355+0000)
I think something like this would be cool:
+
+ 
100 ap
20% cdr
x% mana regen
Can't think of a unique passive or active, any ideas?
Not sure why your tied to mana regen. But since MYMU, Riot pretty much said that regen was going to be reserved for supports, while AP Heavy mages, needed to rely on Maximum mana.
That's why Tear and RoA have been promoted as the primary alternative.
All of this in mind, I don't really think mana itemization is where mage want their build variety. Simply put it, their isn't anything particularly wrong with Morello's being the bread and butter. The one thing I will mention though, is if you adjusted itemization (and champions) so they needed to rely on more than one mana item. That would create variety simply by experimenting with which items to combined.
Though if I had to create a new item for the sake of it, it would probably be similar to Morrello's only with a different passive. (Something that could be situationally be better than grevious wounds.) That would give more options to mages early on, without still serving as their bread and butter.