The rarity of Allure of the Deep is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Allure of the Deep is a skin for Naga Siren. The skin was added to the game on May 17, 2017, it was created by SeeingTriangles.
Allure of the Deep has been recently added to the game, which makes it rather popular with the game community.