Historical Rules · 1 October 2012
Rule 306.3
Official source text from the 1 October 2012 Rules release
Planeswalker subtypes are always a single word and are listed after a long dash: "Planeswalker -- Jace." Each word after the dash is a separate subtype. Planeswalker subtypes are also called planeswalker types. Planeswalkers may have multiple subtypes. See rule 205.3j for the complete list of planeswalker types.