How can you create a combo with Isochron Scepter, Pull from Eternity, Backdraft Hellkite, Karn's Temporal Sundering?
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[START OF COMBO]This combo can be formed with Isochron Scepter, Pull from Eternity, Backdraft Hellkite, Karn's Temporal Sundering

Color identity: URW
Mana cost: {6}{U}{U}
Steps:
  1. Cast the extra turn spell and move to your extra turn.
  2. Activate Isochron Sceptre to cast Pull from Eternity, putting the extra turn spell from exile to your graveyard.
  3. Attack with Backdraft Hellkite to give your extra turn flashback, then cast it.
  4. Repeat for infinite turns.[END OF COMBO STEPS]

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

Other prerequisites:
  - Isochron Scepter must be on the battlefield
  - Pull from Eternity must be exiled
  - Backdraft Hellkite must be on the battlefield
  - Karn's Temporal Sundering must be in your hand
  - Any legendary creature or planeswalker under your control.
[END OF COMBO PREREQUISITES]
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