Barrowin, Smith's Legacy

When Barrowin, enters the battlefield or deals
damage to a player, venture into the dungeon.
If you've completed a dungeon, equipment you
control cost (1) less to equip.
Whenever Barrowin attacks, return up to one
creature or artifact card with a mana value 3 or
less or Mystic forge from your graveyard to the
battlefield if you've completed a dungeon.
"My soul is one with the forge"