Historical Rules · 1 October 2010
Rule 204.3b
Official source text from the 1 October 2010 Rules release
Subtypes of each card type except plane are always single words and are listed after a long dash. Each word after the dash is a separate subtype; such objects may have multiple types. Subtypes of planes are also listed after a long dash, but may be multiple words; all words after the dash are, collectively, a single subtype. Example: "Basic Land -- Mountain" means the card is a land with the subtype Mountain. "Creature -- Goblin Wizard" means the card is a creature with the subtypes Goblin and Wizard. "Artifact -- Equipment" means the card is an artifact with the subtype Equipment.