Fire Lord Azula + Narset's Reversal + Temporal Mastery + Tidal Barracuda

Fire Lord Azula

Narset's Reversal

Temporal Mastery

Tidal Barracuda

How it works

1. Declare Fire Lord Azula as an attacker, triggering its firebending ability, adding .
2. Holding priority, cast Temporal Mastery by paying its mana cost.
3. Fire Lord Azula's second ability triggers, copying Temporal Mastery.
4. Holding priority, cast Narset's Reversal by paying , targeting the original Temporal Mastery 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 Temporal Mastery spell, and then return the original Narset's Reversal to your hand.
7. Resolve the copy of Narset's Reversal, copying Temporal Mastery and returning the original Temporal Mastery to your hand.
8. Resolve both copies of Temporal Mastery from steps 3 and 7, causing you to take two extra turns after this one.
9. Repeat during your second extra turn.