Cloud serpent mounts

Cloud serpent mounts are available in a variety of vibrant colors. When they were first added in Mists of Pandaria, they could only be used with the Cloud Serpent Riding skill, which required reputation with the Order of the Cloud Serpent and was not account-wide. With Cloud Serpent Riding's removal in patch 6.0.2, cloud serpents now have the same skill requirements as most other flying mounts—though they can still be time-consuming to acquire in the first place.

All of these mounts are available to both factions.

Reputation rewards

 * The Reins of the Azure Cloud Serpent, Reins of the Jade Cloud Serpent, and Reins of the Golden Cloud Serpent can be purchased for each from  in the Jade Forest. You must be  with the Order of the Cloud Serpent to purchase them.
 * The Reins of the Thundering August Cloud Serpent can be purchased for from  at the Shrine of Seven Stars or  at the Shrine of Two Moons. You must be  with the August Celestials to purchase this item.
 * The Reins of the Heavenly Golden Cloud Serpent can be purchased for 100,000 Timeless Coin from on the Timeless Isle. You must be  with Emperor Shaohao to purchase this item.

Achievement rewards

 * The Reins of the Crimson Cloud Serpent are a reward from Glory of the Pandaria Hero.
 * The Reins of the Heavenly Crimson Cloud Serpent are a reward from Glory of the Pandaria Raider.
 * The Reins of the Thundering Jade Cloud Serpent can be purchased for from guild vendors after your guild has earned Guild Glory of the Pandaria Raider. You must be  with your guild to purchase this item.
 * The Reins of the Heavenly Azure Cloud Serpent are a reward from Lord of the Reins.

Quest rewards

 * The Reins of the Onyx Cloud Serpent are a reward from Surprise Attack! in the Townlong Steppes. This short questline becomes available after reaching with the Shado-Pan.

Vendor mounts

 * Yu'lei, Daughter of Jade can be purchased for 5,000 Timewarped Badge from Mistweaver Xia on the Timeless Isle.

Drops

 * The Reins of the Astral Cloud Serpent drop from Elegon in the Mogu'shan Vaults.
 * The Reins of the Heavenly Onyx Cloud Serpent drop from the Sha of Anger in Kun-Lai Summit.
 * The Reins of the Thundering Cobalt Cloud Serpent drop from Nalak on the Isle of Thunder
 * The Reins of the Thundering Ruby Cloud Serpent are a guaranteed drop from Alani in the Vale of Eternal Blossoms. You must gather 10 Skyshard to be able to attack her.
 * The Reins of the Thundering Onyx Cloud Serpent drop from Huolon on the Timeless Isle.
 * The Rajani Warserpent can be purchased for 1 Pristine Cloud Serpent Scale from in the Vale of Eternal Blossoms. The scale drops from Rei Lun, who only appears during Assault: The Warring Clans.
 * The Ivory Cloud Serpent is obtained by using a Zan-Tien Lasso on an NPC of the same name, which only appears during Assault: The Warring Clans.

Past arena rewards
These mounts could only be obtained from their respective Mists of Pandaria PvP seasons:
 * The Malevolent Gladiator's Cloud Serpent was a reward for being in the top 0.5% of arena teams at the end of season 12.
 * The Tyrannical Gladiator's Cloud Serpent was a reward for being in the top 0.5% of arena teams at the end of season 13.
 * The Grievous Gladiator's Cloud Serpent was a reward for being in the top 0.5% of arena teams at the end of season 14.
 * The Prideful Gladiator's Cloud Serpent was a reward for being in the top 0.5% of arena teams at the end of season 15.