Historical Rules · 1 May 2012
Rule 307.3
Official source text from the 1 May 2012 Rules release
Sorcery subtypes are always a single word and are listed after a long dash: "Sorcery -- Arcane." Each word after the dash is a separate subtype. The set of sorcery subtypes is the same as the set of instant subtypes; these subtypes are called spell types. Sorceries may have multiple subtypes. See rule 205.3k for the complete list of spell types.