Taii Wakeen, Perfect Shot is a rare Legendary Creature — Human Mercenary card from Outlaws of Thunder Junction Promos (POTJ), collector number 234p. Current market price: $0.24 (foil $0.35), TCGplayer market prices via Scryfall.
Whenever a source you control deals noncombat damage to a creature equal to that creature's toughness, draw a card. {X}, {T}: If a source you control would deal noncombat damage to a permanent or player this turn, it deals that much damage plus X instead.