Angel's Herald is a uncommon Creature — Human Cleric card from Shards of Alara (ALA), collector number 2. Current market price: $0.21 (foil $0.27), TCGplayer market prices via Scryfall.
{2}{W}, {T}, Sacrifice a green creature, a white creature, and a blue creature: Search your library for a card named Empyrial Archangel, put it onto the battlefield, then shuffle.