Reins of the Green Proto-Drake

Source
This item is hatched from Mysterious Egg. These are sold by Geen in Sholazar Basin for, you will need to be at reputation with The Oracles. You may only carry one Mysterious Egg at a time, each of which takes three days to hatch (Patch 4.0.3a). It has an extremely low drop chance (increased slightly in 4.0.3a).

It can be listed on the Black Market Auction House by Mei Francis, for the opening bid of.

Mount Journal
''The vrykul were the first to recognize their potential. Or maybe the second, depending on how you look at it.''