Tocasia's Onulet is a common Artifact Creature — Construct card from The Brothers' War (BRO), collector number 39. Current market price: $0.08 (foil $0.05), TCGplayer market prices via Scryfall.
When this creature leaves the battlefield, you gain 2 life. Unearth {3}{W} ({3}{W}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)