The rarity of Frozen Feather Set is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Frozen Feather Set is a skin for Crystal Maiden. The skin was added to the game on November 29, 2013, it was created by Jaime Lannister.
Frozen Feather Set has been recently added to the game, which makes it rather popular with the game community.