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You could check whether it's already been posted to /r/BrandNewSentence/

That must be an absurdly small subset of the universe of sentences; for example, this sentence itself has likely never been spoken or typed until now.

There are 7.06e57 combinations of playing cards. Odds are that every time someone shuffles a deck of cards it's a unique shuffling.

I found your exact comment in the library of babel, page 82 of a book.

https://libraryofbabel.info/bookmark.cgi?m_hnrvffbgsqubi.82

I came with "Unique first utterer of this performative impredicative statement". I forged it as a profile title[1], and so far no one dared to contradict me. :P

Note that I won't lose my time in a preterition which is giving credits to Russell for the concept impredicativity and to Austin for the concept of performative sentence.

[1] https://www.linkedin.com/in/mathieu-lovato-stumpf-guntz-%E2%...

There is (used to be?) an XKCD IRC channel with a bot that only lets you send messages that have never been uttered in the channel before.

https://blog.xkcd.com/2008/01/14/robot9000-and-xkcd-signal-a...