Pentarch Paladin is a rare Creature — Human Knight card from Time Spiral (TSP), collector number 32. Current market price: $0.46 (foil $6.00), TCGplayer market prices via Scryfall.
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) As this creature enters, choose a color. {W}{W}, {T}: Destroy target permanent of the chosen color.