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The Reins of the Plagued Proto-Drake is a Proto-drake mount. Along with the [Reins of the Black Proto-Drake], it was a reward for the Naxxramas Meta-achievements before being removed after the introduction of Ulduar. This mount can be purchased through the Black Market Auction House.
Here you can buy The Reins of the Plagued Proto-Drake for EU or US Servers.
You'll get guide for getting The Reins of the Plagued Proto-Drake
• You'll be able to get Plagued Proto-Drake
• Plagued Proto-Drake mount
• After patch 10.2 might will need character transfer for access to BMAH