The rarity of The Timekeeper is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
The Timekeeper is a skin for Templar Assassin. The skin was added to the game on February 24, 2016, it was created by Jigglypuff.
The Timekeeper has been recently added to the game, which makes it rather popular with the game community.