Fire Lord Azula | Narset's Reversal

Cards

You have another instant or sorcery in hand that can be cast using at most four colored mana, with valid targets (as applicable).
You have enough mana to cast the additional instant or sorcery minus ({R} magic symbol) ({R} magic symbol) .

Declare
Fire Lord Azula as an attacker, triggering its firebending ability, adding ({R} magic symbol) ({R} magic symbol) .
Cast the additional instant or sorcery by paying its mana cost.
Fire Lord Azula's second ability and
Storm-Kiln Artist trigger.
Resolve the
Fire Lord Azula trigger, copying the instant or sorcery.
Storm-Kiln Artist triggers. Resolve both triggers from this step and step 3, creating two Treasure tokens.
Activate two Treasures by tapping and sacrificing them, adding ({U} magic symbol) ({U} magic symbol) .
Cast
Narset's Reversal by paying ({U} magic symbol) ({U} magic symbol) , targeting the spell from step 2.
Fire Lord Azula's second ability and
Storm-Kiln Artist trigger.
Resolve the
Storm-Kiln Artist trigger, creating a Treasure token.
Resolve the
Fire Lord Azula trigger, copying
Narset's Reversal targeting the original
Narset's Reversal.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the copy of
Narset's Reversal, causing you to copy
Narset's Reversal targeting the original spell from step 2, and then return the original
Narset's Reversal to your hand.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the copy of
Narset's Reversal, copying the spell from step 2 and returning the original spell from step 2 to your hand.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the copy of the spell from step 14.
Holding priority, repeat from step 2.

This combo has been estimated to be Exhibition (Bracket 1+).