The Sticker | Assassin is a High Grade sticker. It comes from the Halo Capsule.
Sticker
Chief (Foil)
Legendary (Foil)
Assassin (Holo)
Chief (Holo)
Incineration (Holo)
Killjoy (Holo)
Noble (Holo)
Chief
Dirty Money
Extermination
Incineration
Killjoy
Legendary
Mister Chief
Noble