Basalt Monolith + Grim Monolith Combos

2 known combos featuring both cards in Commander

Infinite colorless mana that can't be spent to cast nonartifact spells Infinite mana artifacts you control can produce Infinite untap of artifacts you control Infinite colorless mana

Combo 1 with Karn, Legacy Reforged + Lithoform Engine + Clock of Omens

Also requires: Karn, Legacy Reforged Karn, Legacy Reforged Lithoform Engine Lithoform Engine Clock of Omens Clock of Omens
Results: Infinite colorless mana that can't be spent to cast nonartifact spells · Infinite mana artifacts you control can produce · Infinite untap of artifacts you control · Infinite colorless mana
Steps
  1. At the beginning of your upkeep, Karn triggers.
  2. Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, copying Karn's ability.
  3. Resolve the copy of Karn's ability, adding {C} for each artifact you control that cannot be spent to cast nonartifact spells.
  4. Activate Clock of Omens by tapping Basalt Monolith and Grim Monolith, untapping Lithoform Engine.
  5. Activate Basalt Monolith's second ability by paying {3}, untapping it.
  6. Activate Grim Monolith's second ability by paying {4}, untapping it.
  7. Repeat from step 2.

Combo 2 with Karn, Legacy Reforged + Strionic Resonator + Clock of Omens

Also requires: Karn, Legacy Reforged Karn, Legacy Reforged Strionic Resonator Strionic Resonator Clock of Omens Clock of Omens
Results: Infinite colorless mana that can't be spent to cast nonartifact spells · Infinite mana artifacts you control can produce · Infinite untap of artifacts you control · Infinite colorless mana
Show steps
  1. At the beginning of your upkeep, Karn triggers.
  2. Holding priority, activate Strionic Resonator by paying {2} and tapping it, copying Karn's ability.
  3. Resolve the copy of Karn's ability, adding {C} for each artifact you control that cannot be spent to cast nonartifact spells.
  4. Activate Clock of Omens by tapping Basalt Monolith and Grim Monolith, untapping Strionic Resonator.
  5. Activate Basalt Monolith's second ability by paying {3}, untapping it.
  6. Activate Grim Monolith's second ability by paying {4}, untapping it.
  7. Repeat from step 2.
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