Demon's Herald is a uncommon Creature — Human Wizard card from Shards of Alara (ALA), collector number 72. Current market price: $0.13 (foil $0.30), TCGplayer market prices via Scryfall.
{2}{B}, {T}, Sacrifice a blue creature, a black creature, and a red creature: Search your library for a card named Prince of Thralls, put it onto the battlefield, then shuffle.