Howlgeist is a uncommon Creature — Spirit Wolf card from Avacyn Restored (AVR), collector number 182. Current market price: $0.08 (foil $0.25), TCGplayer market prices via Scryfall.
Creatures with power less than this creature's power can't block it. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)