Stone Retrieval Unit [The Brothers' War]

Set: The Brothers' War Type: Artifact Creature — Construct Rarity: Common Cost: {4} When Stone Retrieval Unit enters the battlefield, create a tapped Powerstone token. (It's an artifact with “{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.) Automatons could be rebuilt. Powerstones could not.