The Stage is Yours.

[Skepsis]

From which verse is that exactly?

It's probably there, but again, the "we" does not mean that it is referring to God only. There are several verses that say "we" created this and that "we" have preserved the Quran and similar things, but all of those verses are in reference to God along with the angels plus the unseen creatures, hence the plural "we."

It's off to hear a theist defend the use of "we" the way you are, saying "we" refers to the conglomerate of celestial beings and not solely God.
I hear the "we" is simply a grammatical error dealing with the adaptation, elucidation, and often times transliteraltion of the holy text, or that "we" was simply used as a plural to reflect the importance of the subject in question.
I have no real criticism to offer, just sharing my insight.