Fire Lord Azula, Narset's Reversal, Valley Floodcaller, and Beacon of Tomorrows

Prerequisites

• Fire Lord Azula on the battlefield
• Narset's Reversal in hand
• Valley Floodcaller on the battlefield
• Beacon of Tomorrows in hand
• each other turn available

Steps

1. Declare Fire Lord Azula as an attacker, triggering its firebending ability, adding
2. Holding priority, cast Beacon of Tomorrows by paying its mana cost
3. Fire Lord Azula's second ability triggers, copying Beacon of Tomorrows
4. Holding priority, cast Narset's Reversal by paying , targeting the original Beacon of Tomorrows 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 Beacon of Tomorrows spell, and then return the original Narset's Reversal to your hand
7. Resolve the copy of Narset's Reversal, copying Beacon of Tomorrows and returning the original Beacon of Tomorrows to your hand
8. Resolve both copies of Beacon of Tomorrows 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