Shanid, Sleepers' Scourge is a mythic Legendary Creature — Human Knight card from Dominaria United Commander (DMC), collector number 79. Current market price: $3.45 (foil $4.54), TCGplayer market prices via Scryfall.
Menace Other legendary creatures you control have menace. Whenever you play a legendary land or cast a legendary spell, you draw a card and you lose 1 life.