It means having either the word "artifact" or "Contraption" (or their plurals) in their rules text
Creatures Your deck could revolve around a particular creature type such as goblins, dragons, or rogues
Arabian Nights, as an even earlier expansion, and one that Garfield designed more-or-less by himself (with contributions from the games other Alpha designers) in a very short period of time - has no unifying design theme
Screeching Scorchbeast Steel Mentor: Scorchbeasts are another unfathomable horror that we can thank The Enclave for, and the big threat of Fallout 76's main story
The 60+ might just fit a double-sleeved deck in but we think a little extra space for pulls from a booster and some tokens from the 80+ is helpful
They played up to the set's dramatically different aesthetic incredibly well, with its many legendary creatures pressed through the lens of 1950s and 1960s cartoons