Fire Lord Azula | Narset's Reversal | Vedalken Orrery (and one other card)

Cards

Narset's Reversal and
Alchemist's Gambit in hand.
Fire Lord Azula and
Vedalken Orrery on the battlefield (
Fire Lord Azula without summoning sickness).

({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) each other turn available.

Declare
Fire Lord Azula as an attacker, triggering its firebending ability, adding ({R} magic symbol) ({R} magic symbol) .
Holding priority, cast
Alchemist's Gambit by paying its cleave cost.
Fire Lord Azula's second ability triggers, copying
Alchemist's Gambit.
Holding priority, cast
Narset's Reversal by paying ({U} magic symbol) ({U} magic symbol) , targeting the original
Alchemist's Gambit 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
Alchemist's Gambit spell, and then return the original
Narset's Reversal to your hand.
Resolve the copy of
Narset's Reversal, copying
Alchemist's Gambit and returning the original
Alchemist's Gambit to your hand.
Resolve both copies of
Alchemist's Gambit from steps 3 and 7, causing you to take two extra turns after this one.
Repeat during your second extra turn.

This combo has been estimated to be Ruthless (Bracket 4+).