Clan

A clan is the the principal social unit of a tribal organization: a group of people regarded as being descended from a common ancestor or united by some common trait, characteristic, or interest.

Ice Age

 * Clan Emerald
 * Clan Onyx
 * Clan Pearl
 * Clan Ruby
 * Clan Sapphire

Benalia

 * Clan Rosecot
 * Clan Deniz
 * Clan Tarmula
 * Clan Ternsev
 * Clan Capashen
 * Clan Joryev
 * Clan Croger

Madara

 * Clan Umezawa

Kamigawa

 * Clan Umezawa

Mirrodin

 * The Krark-Clan

Rabiah

 * The Djinn Clans

Ravnica

 * The Gruul Clans
 * The Burning Tree Clan
 * The Ghor Clan
 * The Scab Clan

Tarkir

 * The Abzan Houses
 * The Jeskai Way
 * The Sultai Brood
 * The Mardu Horde
 * The Temur Frontier

Ulgrotha

 * The Clan of the Gentle Wave