The Last Agni Kai — ruling 1

In some cases, the creature you control that is fighting may have deathtouch. Even 1 damage dealt to a creature from a source with deathtouch is considered lethal damage, so any amount greater than that will cause excess damage to be dealt, even if the total amount of damage isn't greater than the opponent's creature's toughness.

The Last Agni Kai — ruling 2

Excess damage has been dealt to a creature if the damage dealt to it is greater than lethal damage. Usually, this means damage greater than its toughness, although damage already marked on the creature is taken into account.

The Last Agni Kai : règles, fonctionnement et interactions (MTG)

The Last Agni Kai is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Target creature you control fights target creature an opponent controls. If the creature the opponent controls is dealt excess damage this way, add that much . Until end of turn, you don't lose unspent red mana as steps and phases end.

Complete guide

The Last Agni Kai is a fiery combat trick that rewards you for overwhelming your opponent's defenses. This instant not only facilitates a duel between creatures but also translates overkill into raw mana, fueling further spells. With the added benefit of mana retention, it ensures your burning momentum doesn't fizzle out prematurely.

Harnessing Excess Damage

The core mechanic of this spell revolves around 'excess damage.' Lethal damage is typically equal to a creature's toughness minus any damage already marked on it. If your creature deals damage beyond this threshold during the fight, the surplus is converted into red mana. For example, if your 5/5 fights a 3/3 with no damage marked on it, you deal 2 excess damage and add two red mana to your pool.

Resolution Step-by-Step

First, you choose two targets: a creature you control and a creature an opponent controls. Upon resolution, both creatures deal damage equal to their power to each other simultaneously. The spell then calculates if excess damage was dealt to the opponent's creature. If it was, the mana is added immediately. Finally, a continuous effect is applied that prevents you from losing unspent red mana as steps and phases end until the turn is over.

Strategic Mana Preservation

A common mistake is forgetting that the mana preservation only applies to red mana. While The Last Agni Kai ensures your generated red mana stays through your second main phase or end step, any other colors in your pool will still vanish as usual. This makes it an excellent setup for high-cost instants or casting additional spells during your post-combat main phase.

Interaction examples

Swapping the Targets

Deflecting Swat

If you cast The Last Agni Kai and your opponent responds with Deflecting Swat, they can change the targets. However, they must still follow the targeting restrictions: the first target must be a creature they control, and the second must be a creature an opponent (likely you) controls. If they successfully swap the targets so their creature wins the fight, they will be the one who generates and keeps the red mana.

Managing the Board State

Chaos Warp

If you target a creature with The Last Agni Kai and your opponent casts Chaos Warp on your creature in response, the fight will not happen. Since one of the two required targets is no longer on the battlefield when The Last Agni Kai tries to resolve, the spell fails to perform the fight. You will not deal excess damage, and you will not add any red mana, though the effect preventing you from losing red mana would still technically apply if the spell resolved with at least one valid target.

The Deathtouch Interaction

If the creature you control has deathtouch, the rules for excess damage change significantly. Because any amount of damage from a source with deathtouch is considered lethal, only 1 damage is needed to satisfy the 'lethal' requirement. If your 5/5 creature with deathtouch fights a 5/5 opponent's creature, you actually deal 4 excess damage and gain four red mana, despite their toughness being equal to your power.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : The Last Agni Kai

Original English text — Wizards of the Coast / Scryfall

#1October 2, 2025· Wizards of the Coast
In some cases, the creature you control that is fighting may have deathtouch. Even 1 damage dealt to a creature from a source with deathtouch is considered lethal damage, so any amount greater than that will cause excess damage to be dealt, even if the total amount of damage isn't greater than the opponent's creature's toughness.
No other card is named in this ruling.
#2October 2, 2025· Wizards of the Coast
Excess damage has been dealt to a creature if the damage dealt to it is greater than lethal damage. Usually, this means damage greater than its toughness, although damage already marked on the creature is taken into account.
No other card is named in this ruling.