Mercury Crystal Power is the phrase Sailor Mercury speaks to reshape her Mercury Crystal, shifting it from a heart into a star so she can rise into her Eternal form beside the other Guardians.
This spoken command lets Sailor Mercury alter the very form of her Mercury Crystal, changing its heart outline into a star. The transformation carries her up to Eternal Sailor Mercury, and she uses it in concert with her fellow Guardians during the manga's climactic confrontation.
By voicing the words, Ami Mizuno reworks the geometry of her Mercury Crystal and ascends to her Eternal state. She channels the resulting power alongside the other Sailor Guardians to reinforce Eternal Sailor Moon's Starlight Honeymoon Therapy Kiss, and the combined push brings down Queen Nehelenia.

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Mercury Crystal Power is the phrase Sailor Mercury speaks to reshape her Mercury Crystal from a heart into a star, a change that carries her up into her Eternal form.
By voicing the phrase, Ami Mizuno reworks the geometry of her Mercury Crystal and ascends to her Eternal state, then channels the resulting power alongside the other Sailor Guardians.
Sailor Mercury channels the power alongside the other Sailor Guardians to reinforce Eternal Sailor Moon's Starlight Honeymoon Therapy Kiss, and the combined push brings down Queen Nehelenia.
No, the 1990s anime never included an equivalent line to Mercury Crystal Power, a notable contrast with the parallel Moon Crystal Power. It appears only in the manga and Sailor Moon Crystal.
Mercury Crystal Power first appeared in Act 49, Dream 11, "Earth and Moon Dream," of the manga, and in Sailor Moon Eternal for the Crystal continuity.
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