Špeciálny 35 kartový balíček s kartami jednej farby. Obsahuje vždy jednu, prípadne dve Mythic alebo Rare karty danej farby. Theme Boosters make a return with Kaldheim. These are great as an intro-level product or for more casual players looking to grab a bunch of cards that match a particular color or theme. There are six different Theme Boosters available: one for each color, and a multicolor Viking booster containing cards that really hit that Norse Viking feel. Just like Set Boosters, Theme Boosters may contain some of the same 20 special cards only available in a few places. Each booster contains 33–34 commons/uncommons and 1–2 rares/mythic rares. Theme Boosters can also contain uncommon showcase cards!