How can you create a combo with Erratic Portal, Emrakul, the Aeons Torn?
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[START OF COMBO]This combo can be formed with Erratic Portal, Emrakul, the Aeons Torn

Color identity: C
Mana cost: {16} each turn plus enough mana to pay commander tax on the first turn, if applicable
Steps:
  1. Cast Emrakul by paying {15} and commander tax, if applicable.
  2. Emrakul triggers, causing you to get an extra turn after this one.
  3. Activate Erratic Portal by paying {1} and tapping it, choosing not to pay and return Emrakul from the battlefield to your hand.
  4. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Erratic Portal must be on the battlefield
  - Emrakul, the Aeons Torn must be in your hand or in the command zone
[END OF COMBO PREREQUISITES]
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