Barrowin of Clan Undurr (AFR 336)

Legendary Creature — Dwarf Cleric • Mana cost: {2}{W}{B} • Adventures in the Forgotten Realms • Uncommon

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.

Illustrated by Russ Nicholson.