Is Frost Queen's Claim still a good item for mid laners? Hello,

I was wondering if FQC is still a good item for mid laners? Now, I only buy FQC for mages with good pick potential that need mana regen on their first item (Ex. Lux and Ahri, as both have an skillshot that if hit on a squishy will usually mean their death) and I'm getting good results myself, but I wonder, is it still optimal?

I checked on op.gg and most people go MPen Boots -&gt; Morello on Lux while I go CDR Boots-&gt; FQC on her.

I personally think it's core on Lux because of the extra gold on hitting her E, that and the fact that landing a Q on a slowed target is very easy, but is it still good on mages like Ahri?