Skulking Knight is a common Creature — Zombie Knight card from Time Spiral (TSP), collector number 130. Current market price: $0.08 (foil $0.19), TCGplayer market prices via Scryfall.
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) When this creature becomes the target of a spell or ability, sacrifice it.