Hour of Devastation contains 199 cards (15 basic lands, 70 commons, 60 uncommons, 42 rares, 12 mythic rares) and includes randomly inserted premium versions of all cards. The expansion symbol represents the horns of Nicol Bolas. The Planeswalker decks contain 10 additional cards that are considered to be part of the set (2 mythic planeswalkers, 2 rares, 2 uncommons, 2 commons and 2 common dual taplands). These are numbered #200/199 to #209/199). Five of basic lands are full-art (different art from the Amonkhet ones).
While the previous set mostly was top-down design inspired by Egypt with some top-down Bolas, Hour of Devastation is mostly top-down Bolas with some top-down Egypt. Starting with Hour of Devastation R&D pulled back significantly on how often Gatewatch planeswalkers appear as cards. The non-full art basic lands were previewed in Archenemy: Nicol Bolas
Each Hour of Devastation Booster Box contains 36 packs of 15 cards each. Premium foil cards are randomly inserted.