Urborg Panther is a common Creature — Nightstalker Cat card from Mirage (MIR), collector number 150. Current market price: $0.19, TCGplayer market prices via Scryfall.
{B}, Sacrifice this creature: Destroy target creature blocking it. Sacrifice a creature named Feral Shadow, a creature named Breathstealer, and this creature: Search your library for a card named Spirit of the Night, put that card onto the battlefield, then shuffle.