How can you create a combo with Prototype Portal, Clock of Omens, Battered Golem, Vault of Whispers?
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[START OF COMBO]This combo can be formed with Prototype Portal, Clock of Omens, Battered Golem, Vault of Whispers

Color identity: B
Mana cost: 
Steps:
  1. Activate Prototype Portal by paying {0}, creating a token copy of Vault of Whispers.
  2. When the Vault of Whispers token enters the battlefield, Battered Golem triggers, untapping itself.
  3. Activate Clock of Omens by tapping Battered Golem and the Vault of Whispers token, untapping Prototype Portal.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite landfall triggers
  - Infinite tapped Vault of Whispers tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Prototype Portal must be on the battlefield
  - Clock of Omens must be on the battlefield
  - Battered Golem must be on the battlefield
  - Vault of Whispers must be exiled
[END OF COMBO PREREQUISITES]
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