Nightpack Ambusher is a rare Creature — Wolf card from Core Set 2020 Promos (PM20), collector number 185p. Current market price: $0.89 (foil $1.43), TCGplayer market prices via Scryfall.
Flash Other Wolves and Werewolves you control get +1/+1. At the beginning of your end step, if you didn't cast a spell this turn, create a 2/2 green Wolf creature token.