User blog comment:TheTobarMethod/Do AP's Need A QSS Upgrade?/@comment-4434378-20130906174625

I would just design it for Swain/Mundo. It needs to be more interesting though.

The issue, is that you either create another boring AP + MR item, or replicate BVeil with a different active. As it stands, Zhonya's is the go to item for Mages, and unless there is some unique way of putting it together, a new item is just not going to cut it.