[Fern]

Personally, the only time I have seen Adon Graxis become really nuts is with a Dullahan. Otherwise I think it's relatively easy to stop most of the time, normally by silencing the caster or preventing them from having 6M as soon as possible. Silence is all over the place as well.

That said, regarding the whole "people pay a lot for it" happens nearly every time a decent 10* boss drop rolls out, sometimes people genuinely just want to try out stuff that sounds cool or rare.

I'd say Adon Graxis is fine where it is for now. I mean, sure, you can probably build a Dullahan dedicated to abusing it and only that, but I'd say that's a problem with Dullahans more so than the invocation.