Rule 205.3n

Planes have their own unique set of subtypes; these subtypes are called planar types. The planar types are The Abyss, Alara, Alfava Metraxis, Amonkhet, Androzani Minor, Antausia, Apalapucia, Arcavios, Arkhos, Avishkar, Azgol, Belenon, Bolas’s Meditation Realm, Capenna, Cridhe, The Dalek Asylum, Darillium, Dominaria, Earth, Echoir, Eldraine, Equilor, Ergamon, Fabacin, Fiora, Gallifrey, Gargantikar, Gobakhan, Horsehead Nebula, Ikoria, Innistrad, Iquatana, Ir, Ixalan, Kaldheim, Kamigawa, Kandoka, Karsus, Kephalai, Kinshala, Kolbahan, Kylem, Kyneth, The Library, Lorwyn, Luvion, Mars, Mercadia, Mirrodin, Moag, Mongseng, Moon, Muraganda, Necros, New Earth, New Phyrexia, Outside Mutter’s Spiral, Phyrexia, Pyrulea, Rabiah, Rath, Ravnica, Regatha, Segovia, Serra’s Realm, Shadowmoor, Shandalar, Shenmeng, Skaro, Spacecraft, Tarkir, Theros, Time, Trenzalore, Ulgrotha, Unknown Planet, Valla, Vryn, Wildfire, Xerex, Zendikar, and Zhalfir.