Barrowin of Clan Undurr is a uncommon Legendary Creature — Dwarf Cleric card from Adventures in the Forgotten Realms (AFR), collector number 336. Current market price: $0.29 (foil $0.42), TCGplayer market prices via Scryfall.
When Barrowin enters, venture into the dungeon. (Enter the first room or advance to the next room.) Whenever Barrowin attacks, return up to one creature card with mana value 3 or less from your graveyard to the battlefield if you've completed a dungeon.