Wishing Star
Astral Charm Owner
I think in this case you might be reading a little too far into specific word choice. In either of those phrases, the overall result is that, if you want the attack to be successful, you have to do [X]. An attack that does nothing is functionally the same thing as no attack at all (and since one of the rules of the game is that you can't perform an action if that action will have absolutely no result/effect on the game, you can't say you're using the attack but refuse to do [X]). Both of those phrases are functionally equivalent - they both make action [X] a requirement for the attack's successful execution.
Is this a case of "I've started, so I'll finish" ("I've started to do this action, but oops, there's something I can't do. I'm going to finish what I've done anyway because I've already started to do it")? It makes sense for "I've started, so I'll finish" to apply here, but does it apply for all cases such as this one?
And (you may not be able to answer, but I might as well ask anyway) if "[Do something] in order to use this attack" and "[Do something] or this attack does nothing" mean the same thing, why not just go with one wording and get rid of the other entirely?