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An Arthur Adams house ad, for an X-MEN collected trade.
Not sure if this is the same material as the collection I own, but I'd guess it collects the X-MEN / ALPHA FLIGHT two-issue miniseries by Claremont and Paul Smith,
And the story from NEW MUTANTS SPECIAL 1, concluded in X-MEN ANNUAL 9, both by Claremont and Arthur Adams, with 2 or 3 subsequent X-MEN ANNUAL issues also by Claremont and Arthur Adams, I think 10 and 12. Material from 1985-1988 or so, in a collected 1988 edition.
I think I have a later edition than the one promoted, that includes more material. I

If it's the one I have, it has a white background on an Arthur Adams cover, and a weak binding that started falling apart the 2nd or 3rd time I read it.
For a long time in the 1980's and 1990's, that was a recurrent problem on a number of Marvel collected editions, but in the 2000's Marvel finally got it together with better bound collections, at least on the collected trades I've gotten since then.

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EDIT :
I looked it up. The one advertised above is:

X-MEN : THE ASGARDIAN WARS (1988, 220 pages)
https://www.mycomicshop.com/search?TID=312791

I dug out the one I have, it's this one :

MARVEL LEGENDS: ARTHUR ADAMS, X-MEN (2003, 288 pages )
https://www.mycomicshop.com/search?TID=489181

Some of the same material, but as detailed in the 2 links, definitely not the same contents.