I'm not sure exactly. It might vary depending on the publisher and releases. You might want to check with the official website or a dedicated comics store for the most accurate count.
It's a collection of DC graphic novels that likely features the Dark Nights Metal storyline in a deluxe edition. This storyline usually involves dark and alternate versions of DC heroes and villains, with complex and often apocalyptic storylines that take readers on a wild ride through the DC multiverse.
In the Dark Nights Metal Deluxe Edition DC Graphic Novels, Batman is probably a key figure as he has been involved in the exploration of the dark multiverse in previous stories related to this. Other main characters could include the Flash, who can help in terms of traversing different dimensions and time. Aquaman might also be involved, considering his importance in the DC universe and his unique abilities that could be useful in the events that unfold in this storyline.