Shisato, Whispering Hunter is a rare Legendary Creature — Snake Warrior card from Champions of Kamigawa (CHK), collector number 242. Current market price: $0.58 (foil $4.29), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, sacrifice a Snake. Whenever Shisato deals combat damage to a player, that player skips their next untap step.