Kashi-Tribe Elite is a uncommon Creature — Snake Warrior card from Saviors of Kamigawa (SOK), collector number 135. Current market price: $0.33 (foil $2.58), TCGplayer market prices via Scryfall.
Legendary Snakes you control have shroud. (They can't be the targets of spells or abilities.) Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.