How can you create a combo with Emrakul, the Promised End, Erratic Portal, Unwinding Clock, Vedalken Orrery?
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[START OF COMBO]This combo can be formed with Emrakul, the Promised End, Erratic Portal, Unwinding Clock, Vedalken Orrery

Color identity: C
Mana cost: 
Steps:
  1. Cast Emrakul by paying {13} reduced by its first ability.
  2. Emrakul's second ability triggers, causing you to gain control of an opponent's next turn and giving them an additional turn after that one.
  3. Move to that opponent's next turn.
  4. Unwinding Clock triggers, untapping all artifacts you control.
  5. Activate artifacts by tapping them to add enough mana to cast Emrakul, plus an additional {1}.
  6. Activate Erratic Portal by paying {1} and tapping it, returning Emrakul from the battlefield to your hand.
  7. Repeat until the opponent you are controlling each extra turn has lost the game.
  8. Repeat for each remaining opponent.[END OF COMBO STEPS]

Result:
  - Infinite turns for each opponent
  - You control your opponents on each of their turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Emrakul, the Promised End must be in your hand
  - Erratic Portal must be on the battlefield
  - Unwinding Clock must be on the battlefield
  - Vedalken Orrery must be on the battlefield
  - You control artifacts that can produce enough mana to cast Emrakul, plus an additional {1}.
[END OF COMBO PREREQUISITES]
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