*Looks at Luden's Echo*

Which is assuming that you have someone within range to be casting spells that much at all times. Between fights she's gonna be no more capable of stacking than Ahri, but given Ahri's insane movement once she gets going that'll more than make up for it. Hell, just casting her ult three times is liable to give you two full stacks between the movement and individual spell casts alone.

Again, I'm not saying that Cass won't be able to use it. But saying that she's going to get so much more use out of it than an Ahri, who can simultaneously cast from afar while moving, given that Cass isn't quite as effective in teamfights comparatively with her main damage ability being on a bit of a short range and requiring a target to click on, I'm gonna have to give the advantage here to Ahri.

Sorry, but Cass's AoE pressure is already there as it is. With how much damage she already does if you just stand there and let her go off on you, this little proc is only going to be adding a few drops to the pond whereas Ahri's gaining some much needed burst while also accenting her refocused role as a kiting mage.

Like, that's exactly what Riot made her to be now. A kite mage. And this is an item for mages who kite well, which Ahri does a heck of a lot better than Cass.

I'm not saying you're entirely wrong man, just that I don't see Cass getting as much benefit in the long run. Sure if someone sits there and takes it up the pooper from her she'll get procs off quicker, but if someone is taking that many of Cass' spells they're probably already dead anyways while Ahri'll just lead them on a merry little chase peppering in spell procs as she goes with perhaps a bit less frequency but a lot more effect.