Saryth, the Viper's Fang is a rare Legendary Creature — Human Warlock card from Innistrad: Midnight Hunt Promos (PMID), collector number 197p. Current market price: $1.91 (foil $1.91), TCGplayer market prices via Scryfall.
Other tapped creatures you control have deathtouch. Other untapped creatures you control have hexproof. {1}, {T}: Untap another target creature or land you control.