Kayle, Teemo, and Taric are the only champions I used it on. And sadly, they all NEED that mana regen.
Kayle isn't too bad on mana, unless you're having to use your heal every single CD. That little bit of mana regen was the perfect amount she need (needs).
Teemo generally has mana problems with shrooms, and again, if you're having to spam your Q.
Annnnd Taric, always has mana issues. And like OP said, mana tear is almost always too big of an investment. (I know not many get Nashors on him).
It was really not a necessary nerf, everyone that uses it benefits from the mana regen. And there never has been much of a problem with it all this time.
Originally Posted by hollowtek
simple: indirect nerf to kayle. She's quite literally one of the only champs that use it, and this was to curb her sustain a bit.
This is the only logic I can see behind ever touching it. Kayle is FotM, so lets nerf one of her main items.