All time Greatest Graphic Novels (in no particular order) #32: X-MEN: DARK PHOENIX SAGA 

(W) Chris Claremont (A) John Byrne (CA) John Byrne
An Epic Tale Of Triumph And Tragedy! When The Dark Phoenix Rises, Suns Grow Cold And Universes Die! The X-Men Embark On An Adventure That Will Span The Cosmos As One Of Their Own, Jean Grey, Has Unwittingly Attained Power Beyond Conception - And Been Corrupted, Absolutely. The X-Men Must Decide: Is The Life Of The Woman They Cherish Worth The Existence Of An Entire Universe? This Touching Tale Of Ultimate Power And The Triumph Of The Human Spirit Has Been A Cornerstone Of The X-Men Mythos For More Than Three Decades. Now, Relive The Dark Phoenix Saga With This Deluxe Collection, Bursting At The Seams With Extra Stories That Illuminate New And Different Facets Of The World Of The Phoenix! Collecting X-Men (1963) #129-137.

https://thecomicbookshop.co.uk/shop/index.php?main_page=product_info&cPath=23&products_id=11012

9780785164210