Teroh's Vanguard is a uncommon Creature — Human Nomad card from Torment (TOR), collector number 19. Current market price: $0.13 (foil $0.68), TCGplayer market prices via Scryfall.
Flash Threshold — As long as there are seven or more cards in your graveyard, this creature has "When this creature enters, creatures you control gain protection from black until end of turn."