How can you create a combo with Riku of Two Reflections, Narset's Reversal, Nexus of Fate?
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[START OF COMBO]This combo can be formed with Riku of Two Reflections, Narset's Reversal, Nexus of Fate

Color identity: GUR
Mana cost: {5}{U}{U}{U}{U}{U}{R} each turn
Steps:
  1. Cast Nexus of Fate by paying {5}{U}{U}.
  2. Riku's first ability triggers - choose not to pay.
  3. Holding priority, cast Narset's Reversal by paying {U}{U}, targeting Nexus of Fate.
  4. Riku's first ability triggers, causing you to pay {U}{R} to copy Narset's Reversal, with the copy targeting the original Narset's Reversal.
  5. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Nexus of Fate, and returning the original Narset's Reversal to your hand.
  6. Resolve the copy of Narset's Reversal created in step 5, copying Nexus of Fate and returning the original Nexus of Fate to your hand.
  7. Resolve Nexus of Fate, causing you to take an extra turn after this one.
  8. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Riku of Two Reflections must be on the battlefield
  - Narset's Reversal must be in your hand
  - Nexus of Fate must be in your hand
[END OF COMBO PREREQUISITES]
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