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The Reins of the Onyxian Drake is a flying mount that drops from Onyxia. The Reins can drop in either the 10-player or 25-player version of the instance, and has an extremely low (1% - 2%) drop chance. It also has a chance to be listed on the Black Market Auction House.
Here you can buy The Reins of the Onyxian Drake for EU or US Servers.
You'll get guide for getting The Reins of the Onyxian Drake
You'll be able to get Onyxian Drake
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option