This issue is a variant of Uncanny X-Men (Marvel, 2013 series) #27 [Direct Edition]. There exist further variants.
In the center of the comic is a double gatefold promotional advertisement.
This variant cover is a swipe/tribute to The Uncanny X-Men (Marvel, 1981 series) #201, originally rendered by Rick Leonardi and Whilce Portacio.
This variant cover is a mixed media project which incorporates vintage hand-drawn backgrounds combined with photographic figure elements.