Historical Rules · 4 February 2011
Rule 306.3
Official source text from the 4 February 2011 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 204.3i for the complete list of planeswalker types.