How can you create a combo with Karn, Legacy Reforged, Lithoform Engine, Filigree Sages, Chromatic Orrery?
user
[START OF COMBO]This combo can be formed with Karn, Legacy Reforged, Lithoform Engine, Filigree Sages, Chromatic Orrery

Color identity: U
Mana cost: {2}
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 Filigree Sages by paying {3}, untapping Lithoform Engine.
  5. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least two additional artifacts.
[END OF COMBO PREREQUISITES]
assistant