Hound of Griselbrand is a rare Creature — Elemental Dog card from Avacyn Restored (AVR), collector number 141. Current market price: $0.30 (foil $1.20), TCGplayer market prices via Scryfall.
Double strike 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.)