Shilgengar, Sire of Famine is a rare Legendary Creature — Elder Demon card from Modern Horizons 3 (MH3), collector number 109. Current market price: $0.31 (foil $0.41), TCGplayer market prices via Scryfall.
Flying Sacrifice another creature: Create a Blood token. If you sacrificed an Angel this way, create a number of Blood tokens equal to its toughness instead. {W/B}{W/B}{W/B}, Sacrifice six Blood tokens: Return each creature card from your graveyard to the battlefield with a finality counter on it. Those creatures are Vampires in addition to their other types.