Historical Rules · 1 May 2012
Rule 205.3n
Official source text from the 1 May 2012 Rules release
Planes have their own unique set of subtypes; these subtypes are called planar types. The planar types are Alara, Arkhos, Bolas's Meditation Realm, Dominaria, Equilor, Iquatana, Ir, Kaldheim, Kamigawa, Karsus, Kinshala, Lorwyn, Luvion, Mercadia, Mirrodin, Moag, Muraganda, Phyrexia, Pyrulea, Rabiah, Rath, Ravnica, Segovia, Serra's Realm, Shadowmoor, Shandalar, Ulgrotha, Valla, Wildfire, and Zendikar.