How can you create a combo with Karn, Legacy Reforged, Karn, Silver Golem, Lithoform Engine, Voltaic Construct?
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[START OF COMBO]This combo can be formed with Karn, Legacy Reforged, Karn, Silver Golem, Lithoform Engine, Voltaic Construct

Color identity: C
Mana cost: {3}
Steps:
  1. At the beginning of your upkeep, Karn, Legacy Reforged triggers.
  2. Holding priority, activate Karn, Silver Golem by paying {1}, causing Lithoform Engine to become an artifact creature until end  of turn.
  3. Activate Lithoform Engine's first ability by paying {2} and tapping it, copying Karn, Legacy Reforged's ability.
  4. Resolve the copy of Karn, Legacy Reforged's ability, adding {C} for each artifact you control that cannot be spent to cast nonartifact spells.
  5. Activate Voltaic Construct by paying {2}, untapping Lithoform Engine.
  6. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana that cannot be spent to cast nonartifact spells
  - Infinite untap of artifact creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Lithoform Engine does not have summoning sickness.
  - You control at least one additional artifact.
[END OF COMBO PREREQUISITES]
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