Matsu-Tribe Birdstalker is a common Creature — Snake Warrior Archer card from Saviors of Kamigawa (SOK), collector number 137. Current market price: $0.10 (foil $0.29), TCGplayer market prices via Scryfall.
Whenever this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step. {G}: This creature gains reach until end of turn. (It can block creatures with flying.)