Fire Lord Azula | Narset's Reversal

Cards

Lands you control can tap to produce at least ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) .

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

You can tap creatures or artifacts instead if they can produce enough mana, or if you have excess mana.