How can you create a combo with Narset's Reversal, Isochron Scepter?
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[START OF COMBO]This combo can be formed with Narset's Reversal, Isochron Scepter

Color identity: U
Mana cost: {2} plus enough mana to cast the extra turn spell each turn
Steps:
  1. Cast the extra turn spell by paying its mana cost.
  2. Holding priority, activate Isochron Scepter by paying {2} and tapping it, casting a copy of Narset's Reversal.
  3. Resolve the copy of Narset's Reversal, causing you to copy the extra turn spell, and return the original extra turn spell to your hand.
  4. Resolve the copy of the extra turn spell, causing you to take at least one extra turn after this one.
  5. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Narset's Reversal must be exiled
  - Isochron Scepter must be on the battlefield
[END OF COMBO PREREQUISITES]
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