User blog comment:Pacpac1997/Possible New Debuff Kind: Hp Freeze/@comment-5009341-20120619190510/@comment-3450702-20120619195607

In the current meta, heal is used 99% of the games on the AD Carry, in addition to flash, while the support grabs two of either CV, exhaust or flash. So it's certainly not rarely used. But it still might be used as an exception.