Eldritch Moon continues where Shadows over Innistrad left off. It expands its horror theme into Lovecraftian Cosmic Horror. The set contains 205 cards (74 commons, 70 uncommons, 47 rares, 14 mythic rares), including 15 double-faced cards, 6 meld cards (3 pairs), and randomly inserted premium (foil) versions of all cards. A checklist card replaces the basic land in some boosters.
Themes and mechanics: Madness, Transform, Skulk, and Delirium are carried over from the previous set. There are also three new named mechanics; Meld, Emerge, and Escalate.