Isao, Enlightened Bushi is a rare Legendary Creature — Human Samurai card from Betrayers of Kamigawa (BOK), collector number 129. Current market price: $0.78 (foil $9.35), TCGplayer market prices via Scryfall.
This spell can't be countered. Bushido 2 (Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn.) {2}: Regenerate target Samurai.