The phrase "a rare set" is correct and usable in written English.
You can use it to describe a collection of items that is uncommon or not frequently found.
Example: "The museum displayed a rare set of ancient coins that attracted many visitors."
Alternatives: "an uncommon collection" or "a unique assortment".
It will also mean naming someone with a rare set of skills to run Medicare.
ESG performs a rare set at Bowery Electric on March 8, celebrating forty years of otherworldly sounds.
Coastal towns are braced for the highest 'super tides' in 19 years as a rare set of astronomical forces align.
ABHD12 mice display massive increases in a rare set of very long chain LPS lipids that have been previously reported as Toll-like receptor 2 activators.
And you leave us now equipped with a rare set of skills and steeped in this community's deepest values: A commitment to excellence.
And now you leave us, equipped with a rare set of skills, and steeped in this community's deepest values: A commitment to excellence.
— Late-season swarm of tornadoes: A rare set of late October tornadoes touched down from Massachusetts to Rhode Island on Tuesday, The Post's Matthew Cappucci reports.
The chairs on the front page are Louis XVI (about 1780) from a rare set of 12 ($140,000, complete with settee).
Moroder brings five decades of thump to this midsize North Brooklyn club for a rare set of disco classics and forward-thinking electronic cuts.
In 2005, he brokered an agreement with the Vatican Library to lend a rare set of manuscripts by the medieval Jewish philosopher Maimonides to the Israel Museum.
Ursino will join the Department of Ecology and Evolutionary Biology, where her postdoctoral research will bring together a rare set of samples collected in Argentina with cutting-edge genetic techniques.
