Witchbane Orb is a rare Artifact card from Innistrad (ISD), collector number 236. Current market price: $0.36 (foil $1.13), TCGplayer market prices via Scryfall.
When this artifact enters, destroy all Curses attached to you. You have hexproof. (You can't be the target of spells or abilities your opponents control, including Aura spells.)