How can you create a combo with Wormfang Manta, Erratic Portal, Sundial of the Infinite?
user
[START OF COMBO]This combo can be formed with Wormfang Manta, Erratic Portal, Sundial of the Infinite

Color identity: U
Mana cost: {7}{U}{U}
Steps:
  1. Cast Wormfang Manta by paying {5}{U}{U}.
  2. Wormfang Manta enters the battlefield, triggering itself.
  3. In response, activate Erratic Portal by paying {1} and tapping it, returning Wormfang Manta from the battlefield to your hand.
  4. When Wormfang Manta leaves the battlefield, it triggers, causing you to take an extra turn after this one.
  5. Activate Sundial of the Infinite by paying {1} and tapping it, ending the turn and preventing Wormfang Manta's ETB ability from resolving.
  6. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Wormfang Manta must be in your hand
  - Erratic Portal must be on the battlefield
  - Sundial of the Infinite must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant