WoWDB

TCG mount from the Worldbreaker-expansion card called Mottled Drake. The code on the card must be redeemed at WoW's Promotion Code Retrieval Page for a second code that can be used in-game by speaking with Landro Longshot.

The WoW:TCG card is worth serious real-life money due to its scarcity. You likely won't see the mount in-game, though a high server population and CRZ do increase your chances of spotting it.