Karn's Temporal Sundering + Narset's Reversal + Riku of Two Reflections

Mana needed: {4}{U}{U}{U}{U}{U}{R} each turn

GUR identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast Karn's Temporal Sundering by paying {4}{U}{U}.
  2. Riku's first ability triggers - choose not to pay.
  3. Holding priority, cast Narset's Reversal by paying {U}{U}, targeting Karn's Temporal Sundering.
  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 Karn's Temporal Sundering, and returning the original Narset's Reversal to your hand.
  6. Resolve the copy of Narset's Reversal created in step 5, copying Karn's Temporal Sundering and returning the original Karn's Temporal Sundering to your hand.
  7. Resolve Karn's Temporal Sundering, causing you to take an extra turn after this one.
  8. Repeat each turn.

What the combo produces