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'more rare' is correct and usable in written English.
You might use it when comparing two items to show that one is rarer than the other. For example, "The silverback gorillas are becoming increasingly more rare in the wild than their relatives, the mountain gorillas."
Exact(60)
It's much more rare.
Combining basketball and baseball is more rare.
And something more rare: it was beautiful.
"It's also a little more rare".
But this is even more rare.
"And that's becoming more and more rare".
"They're more rare than gold," he said.
It's more rare than Shakespeare's first folio.
That's more rare than you might think.
It's more rare, and therefore more precious.
"Latvian customers are more rare," Ms. Bogodistaja said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com