Ninja is a uncommon Creature — Ninja card from Unstable (UST), collector number 61. Current market price: $0.14 (foil $0.64), TCGplayer market prices via Scryfall.
You may activate this card's augment ability any time you could cast an instant. Whenever this creature deals combat damage to a player, Augment {2}{B} ({2}{B}, Reveal this card from your hand: Combine it with target host. Augment only as—oh, never mind.)