How can you create a combo with Gonti's Aether Heart, Prototype Portal, Lithoform Engine, Virtue of Knowledge // Vantress Visions?
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[START OF COMBO]This combo can be formed with Gonti's Aether Heart, Prototype Portal, Lithoform Engine, Virtue of Knowledge // Vantress Visions

Color identity: U
Mana cost: {8} each turn
Steps:
  1. Activate Prototype Portal by paying {6} and tapping it.
  2. Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, copying Prototype Portal's ability.
  3. Resolve the copy of Prototype Portal's ability, creating a token copy of Gonti's Aether Heart.
  4. When the Gonti's Aether Heart token enters the battlefield, it triggers twice, causing you to get {E}{E}{E}{E}.
  5. Resolve the original Prototype Portal ability, creating a token copy of Gonti's Aether Heart.
  6. Put either Gonti's Aether Heart token into your graveyard due to the legend rule.
  7. When the Gonti's Aether Heart token enters the battlefield, it triggers twice, causing you to get {E}{E}{E}{E}.
  8. Activate the remaining Gonti's Aether Heart token by paying eight {E} and exiling it, causing you to take an extra turn after this one.
  9. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Gonti's Aether Heart must be exiled
  - Prototype Portal must be on the battlefield
  - Lithoform Engine must be on the battlefield
  - Virtue of Knowledge // Vantress Visions must be on the battlefield
[END OF COMBO PREREQUISITES]
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