Matsu-Tribe Decoy is a common Creature — Snake Warrior card from Champions of Kamigawa (CHK), collector number 227. Current market price: $0.13 (foil $0.50), TCGplayer market prices via Scryfall.
{2}{G}: Target creature blocks this creature this turn if able. Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.