Powerstone Maker

Produces Powerstone tokens, tapped colorless artifacts that add one mana that can't be spent to cast nonartifact spells. Karn, Living Legacy spins them off a +1, Splitting the Powerstone and Fallaji Excavation drop multiples at once, and Stone Retrieval Unit and Powerstone Engineer make them on enter or death triggers. Distinct from Treasure Maker, whose artifacts sacrifice for one mana of any color spent on anything, and from Artifact Token Maker, which makes artifact creature bodies rather than these mana rocks. Note Cityscape Leveler and Thran Spider can hand a Powerstone to an opponent, but they still produce the token.