Lord of the Forsaken is a mythic Creature — Demon card from Innistrad: Midnight Hunt Promos (PMID), collector number 110s. Current market price: — (foil $1.79), TCGplayer market prices via Scryfall.
Flying, trample {B}, Sacrifice another creature: Target player mills three cards. Pay 1 life: Add {C}. Spend this mana only to cast a spell from your graveyard.