Fire Lord Azula + Narset's Reversal + Turnabout

Prerequisites

Lands you control can tap to produce at least {1}{U}{U}.

Steps

1. Declare Fire Lord Azula as an attacker, triggering its firebending ability, adding {R}{R}.
2. Holding priority, activate any number of lands by tapping them, adding at least {1}{U}{U}.
3. Cast Turnabout by paying {2}{U}{U}
4. Fire Lord Azula's second ability triggers, copying Turnabout.
5. Resolve the copy of Turnabout, causing you to untap all lands you control.
6. Holding priority, activate any number of lands by tapping them, adding at least {1}{U}{U}.
7. Cast Narset's Reversal by paying {U}{U}, targeting the original Turnabout spell.
8. Fire Lord Azula's second ability triggers, copying Narset's Reversal, targeting the original Narset's Reversal.
9. Resolve the copy of Narset's Reversal, causing you to copy Narset's Reversal targeting the original Turnabout spell, and then return the original Narset's Reversal to your hand.
10. Resolve the copy of Narset's Reversal, copying Turnabout and returning the original Turnabout to your hand.
11. Resolve the copy of Turnabout from step 9, causing you to untap all lands you control.
12. Holding priority, repeat from step 2.