Sauron, the Necromancer is a rare Legendary Creature — Avatar Horror card from Tales of Middle-earth Promos (PLTR), collector number 106s. Current market price: — (foil $9.15), TCGplayer market prices via Scryfall.
Menace Whenever Sauron attacks, exile target creature card from your graveyard. Create a tapped and attacking token that's a copy of that card, except it's a 3/3 black Wraith with menace. At the beginning of the next end step, exile that token unless Sauron is your Ring-bearer.