Masterful Ninja is a rare Creature — Troll Ninja card from Unstable (UST), collector number 60. Current market price: $0.33 (foil $0.54), TCGplayer market prices via Scryfall.
Haste Reveal this card from your hand: Masterful Ninja is on the battlefield and in your hand until end of turn. {1}{B}: This creature gets +1/+1 until end of turn.