Gustcloak Cavalier is a uncommon Creature — Human Knight card from Time Spiral (TSP), collector number 22. Current market price: $0.28 (foil $0.30), TCGplayer market prices via Scryfall.
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) Whenever this creature attacks, you may tap target creature. Whenever this creature becomes blocked, you may untap this creature and remove it from combat.