Witch-king of Angmar is a mythic Legendary Creature — Wraith Noble card from The Hobbit Commander (HOC), collector number 20. Current market price: $13.44 (foil $14.84), TCGplayer market prices via Scryfall.
Flying Whenever one or more creatures deal combat damage to you, each opponent sacrifices a creature of their choice that dealt combat damage to you this turn. The Ring tempts you. Discard a card: Witch-king of Angmar gains indestructible until end of turn. Tap him.