The rarity of Cape of the Rowdy Firebrand is Mythical. At this moment the item is available for trade.
Cape of the Rowdy Firebrand is a skin for Batrider. The skin was added to the game on July 31, 2015, it was created by OrganizedChaos.
Cape of the Rowdy Firebrand has been recently added to the game, which makes it rather popular with the game community.