Uncanny X-Men is one of the most important Marvel runs ever published. From the end of the original X-Men era, through the Claremont revival, the Dark Phoenix Saga, Days of Future Past, Alpha Flight, Gambit and beyond, this title is packed with major keys. For this list, I have ranked the strongest Uncanny X-Men keys from 1970 onwards using value as the main deciding factor, while also considering long-term character importance, story significance and collector demand. Prices