The rarity of Winter's Warden is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Winter's Warden is a skin for Crystal Maiden. The skin was added to the game on November 30, 2017, it was created by Chameleon.
Winter's Warden is currently one of the most popular skins, but it is rarely seen in the game due to its high price.