Historical Rules · 1 February 2012
Rule 302.3
Official source text from the 1 February 2012 Rules release
Creature subtypes are always a single word and are listed after a long dash: "Creature -- Human Soldier," "Artifact Creature -- Golem," and so on. Creature subtypes are also called creature types. Creatures may have multiple subtypes. See rule 205.3m for the complete list of creature types. Example: "Creature -- Goblin Wizard" means the card is a creature with the subtypes Goblin and Wizard.