Charcoal DiamondrampBudget$0.71One-mana slower mana rock that still produces black mana and fits into black-centric ramp packages. It is a clean noncreature alternative to Leaden Myr with similar fixing.
Mind StonerampBudget$0.31A colorless 2-mana rock with the same early acceleration role. It does not make black specifically, but it is a widely played functional substitute for 2-mana ramp.
Coldsteel Heartramp$0.99Comes down at the same point and fixes into black mana while being more resilient than a creature. It serves the same job of accelerating into higher-cost spells.
Fellwar Stoneramp$1.91Another efficient 2-mana mana rock that often taps for black in multiplayer games. It is a strong functional equivalent for two-color and Commander mana smoothing.
Prismatic LensrampBudget$0.38A similar 2-mana artifact that can help filter into black mana. It is a budget-friendly alternative when you want a simple early rock.
Liquimetal Torqueramp$3.81A 2-mana mana rock that produces colorless immediately and can sometimes help enable artifact synergies. It is not black mana specifically, but it fills the same early ramp slot.
Everflowing ChalicerampBudget$0.19Scalable artifact ramp that can occupy the same early acceleration role. It is better in decks that can spend extra mana later, though it lacks black fixing.
Arcane SignetrampBudget$0.64The premier 2-mana rock for Commander, making black mana directly and more reliably than Leaden Myr. It is a strict upgrade in most black decks.