Originally Posted by Nyx87
Anivia, Singed, Karthus, Ryze, Kassadin, Swain might want to try it. ... any others?
Singed will never charge it in time, and for most characters it doesn't even begin to be worth it. You don't need sustain in dominion and the mana > ap ratios are nothing worth stacking over with so many other good items in the game.
If you need regen get a grail, if you need mana pool there's glacial shroud, ROA, lich bane, odin's, etc. In the end AA Staff and Manamune are gimmick items and people love to try to justify using gimmick items, it's why people try to work lichbane into every build no matter how bad it is on their champ.