Saryth, the Viper's Fang is a rare Legendary Creature — Human Warlock card from Murders at Karlov Manor Commander (MKC), collector number 185. Current market price: $3.72, 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.