Kinscaer Sentry is a rare Creature — Kithkin Soldier card from Lorwyn Eclipsed (ECL), collector number 300. Current market price: $0.50 (foil $1.19), TCGplayer market prices via Scryfall.
First strike, lifelink Whenever this creature attacks, you may put a creature card with mana value X or less from your hand onto the battlefield tapped and attacking, where X is the number of attacking creatures you control.