Is pressence of mind usefull to anyone?
except 
except 
I use it on MF and Ashe.
i like sion with that, ultimate hunter, and either dark harvest or predator but otherwise idunno
Besides ARAM i dont play anyone that uses it.
Maybe
if she goes into precision to get tenacity
i take it in most ARAM games
good on yuumi and pyke too, since their ults are so important, they generally have high KP, and they don't really need a legend: rune
i find it useful on champs with high mana costs, such as
. the ult cd reduction is a nice +, but I mostly take it for mana

And lastly possibly Zilean, Neeko, Ori, it's mainly of course good for champs that really rely hard on their ults, aka fiddles and malph IMO.
Can be not optimal on