How can you create a combo with Yarok, the Desecrated, Soul Foundry, Corridor Monitor, Great Whale?
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[START OF COMBO]This combo can be formed with Yarok, the Desecrated, Soul Foundry, Corridor Monitor, Great Whale

Color identity: BGU
Mana cost: {8}
Steps:
  1. Cast Soul Foundry by paying {4}.
  2. Soul Foundry enters the battlefield, triggering its imprint ability twice, exiling Great Whale and Corridor Monitor.
  3. Activate up to seven lands you control by tapping them, adding at least {5}.
  4. Activate Soul Foundry by paying {9} and tapping it, creating a token copy of Great Whale and Corridor Monitor.
  5. The Great Whale and Corridor Monitor tokens enter the battlefield, triggering their abilities twice.
  6. Resolve both Corridor Monitor triggers, untapping Soul Foundry.
  7. Resolve the first Great Whale trigger, untapping up to seven lands you control.
  8. Activate up to seven lands you control by tapping them, adding at least {5}.
  9. Resolve the second Great Whale trigger, untapping up to seven lands you control.
  10. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite mana permanents you control can produce
  - Infinite untap of permanents you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be in your hand
  - Panharmonicon on the battlefield.You control up to seven lands that can tap to produce at least {5}.
[END OF COMBO PREREQUISITES]
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