How can you create a combo with Prototype Portal, Gonti's Aether Heart, Voltaic Key, Lithoform Engine?
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[START OF COMBO]This combo can be formed with Prototype Portal, Gonti's Aether Heart, Voltaic Key, Lithoform Engine

Color identity: C
Mana cost: 
Steps:
  1. Activate Prototype Portal by paying {6} and tapping it.
  2. In response, activate Lithoform Engine by paying {2} and tapping it, copying Prototype Portal's activated ability.
  3. Activate Voltaic Key by paying {1} and tapping it, untapping Lithoform Engine.
  4. activate Lithoform Engine by paying {2} and tapping it, copying Prototype Portal's activated ability again.
  5. Resolve one Prototype Portal ability, creating a token copy of Gonti's Aether Heart.
  6. Gonti's Aether Heart triggers, adding {E}{E}.
  7. Resolve a second Prototype Portal ability, creating a token copy of Gonti's Aether Heart.
  8. Put one of the Gonti's Aether Heart tokens into the graveyard due to the legend rule.
  9. Both Gonti's Aether Heart copies trigger, adding a total of {E}{E}{E}{E}.
  10. Resolve the last Prototype Portal ability, creating a token copy of Gonti's Aether Heart.
  11. Put one of the Gonti's Aether Heart tokens into the graveyard due to the legend rule.
  12. Both Gonti's Aether Heart copies trigger, adding a total of {E}{E}{E}{E}.
  13. Activate the Gonti's Aether Heart token by paying eight {E} and exiling it, causing you to take an extra turn after this one.
  14. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Gonti's Aether Heart must be exiled
  - Voltaic Key must be on the battlefield
  - Lithoform Engine must be on the battlefield
  - Eleven generic mana available each turn.
[END OF COMBO PREREQUISITES]
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