The Sticker | Hippocamp is a High Grade sticker. It comes from the Bestiary Capsule.
Sticker
Basilisk (Foil)
Dragon (Foil)
Phoenix Reborn (Foil)
Hippocamp (Holo)
Manticore (Holo)
Pegasus (Holo)
Sphinx (Holo)
Basilisk
Dragon
Manticore
Pegasus
Phoenix Reborn
Sphinx