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

Color identity: GUR
Mana cost: {5}{U}{U}{U}{U}{U}{R} each turn
Steps:
  1. Cast Alrund's Epiphany 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 Alrund's Epiphany.
  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 Alrund's Epiphany, and returning the original Narset's Reversal to your hand.
  6. Resolve the copy of Narset's Reversal created in step 5, copying Alrund's Epiphany and returning the original Alrund's Epiphany to your hand.
  7. Resolve Alrund's Epiphany, 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
  - Alrund's Epiphany must be in your hand
[END OF COMBO PREREQUISITES]
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