Signed by the author Gene Luen Yang who has drawn Superman's "S" shield above his autograph.
From the publisher:
Worlds collide! In the aftermath of Dark Nights: Death Metal comes a glimpse into brave new worlds within the DC Universe--but what are these strange planets? You have never seen Batman and Superman like this before-so buckle up and get ready for Gene Luen Yang and Ivan Reis's epic tale!
Collecting Batman/Superman #16-21!