The rarity of Shard of the Lost Star is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Shard of the Lost Star is a skin for Morphling. The skin was added to the game on August 19, 2015, it was created by daniDem.
Shard of the Lost Star has been recently added to the game, which makes it rather popular with the game community.