Fire Lord Azula, Narset's Reversal, Tidal Barracuda, and Karn's Temporal Sundering

Prerequisites

• Fire Lord Azula on the battlefield
• Narset's Reversal in hand
• Tidal Barracuda on the battlefield
• Karn's Temporal Sundering in hand
• each other turn available

Steps

1. Declare Fire Lord Azula as an attacker, triggering its firebending ability, adding
2. Holding priority, cast Karn's Temporal Sundering by paying its mana cost
3. Fire Lord Azula's second ability triggers, copying Karn's Temporal Sundering
4. Holding priority, cast Narset's Reversal by paying , targeting the original Karn's Temporal Sundering spell
5. Fire Lord Azula's second ability triggers, copying Narset's Reversal, targeting the original Narset's Reversal
6. Resolve the copy of Narset's Reversal, causing you to copy Narset's Reversal targeting the original Karn's Temporal Sundering spell, and then return the original Narset's Reversal to your hand
7. Resolve the copy of Narset's Reversal, copying Karn's Temporal Sundering and returning the original Karn's Temporal Sundering to your hand
8. Resolve both copies of Karn's Temporal Sundering from steps 3 and 7, causing you to take two extra turns after this one
9. Repeat during your second extra turn

Results

• Infinite turns