Lord of the Forsaken is a mythic Creature — Demon card from Innistrad: Midnight Hunt Promos (PMID), collector number 110p. Current market price: $0.61 (foil $0.70), 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.