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How is Damage Calculated in MTG?

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In Magic: The Gathering (MTG), damage calculation is a core mechanic that determines how creatures, planeswalkers, and players lose life or are destroyed. The fundamental principle is that damage is dealt as a number, and that number is subtracted from the recipient’s toughness (for creatures), loyalty (for planeswalkers), or life total (for players). However, the process isn’t always straightforward and involves multiple layers of rules and interactions. Here’s a comprehensive breakdown:

The basic formula for damage calculation is this: Source of Damage (e.g., a creature, a spell) deals X damage to a Target (e.g., a creature, a planeswalker, a player). This damage is dealt as combat damage or noncombat damage. The target’s toughness, loyalty, or life total, respectively, is then reduced by X (after any relevant prevention or redirection effects).

The key aspects to consider in damage calculation include:

Source of Damage: The origin of the damage, which can be a creature, a spell, an ability, or even the game rules itself.
Type of Damage: Damage can be combat damage (dealt during the combat phase) or noncombat damage (dealt by spells and abilities outside of combat).
Amount of Damage: The numerical value of the damage being dealt.
Target of Damage: The creature, planeswalker, or player receiving the damage.
Damage Prevention: Effects that reduce or prevent damage, such as “prevent the next 3 damage that would be dealt to target creature.”
Damage Redirection: Effects that change the target of the damage, such as “the next time a source would deal damage to you this turn, it deals that damage to target creature you control instead.”
Damage Assignment Order: When multiple creatures block, the attacking player assigns damage in a specific order.
Lethal Damage: Enough damage to destroy a creature or planeswalker, or reduce a player’s life total to zero.

Let’s delve deeper into each of these aspects.

Combat Damage

Combat damage occurs during the combat phase. Here’s how it works:

Declare Attackers: The active player chooses which creatures they control will attack, and which player or planeswalker each creature is attacking.
Declare Blockers: The defending player declares which creatures they control will block the attacking creatures. A creature can be blocked by multiple creatures, but each creature can only block one attacking creature.
Combat Damage Step: This is where the damage is actually dealt.
- Unblocked Attackers: An unblocked attacker deals combat damage equal to its power to the player or planeswalker it’s attacking.
- Blocked Attackers: The attacking player assigns combat damage from each attacking creature to its blockers. The attacking player must assign at least enough damage to the first blocker in the order to destroy it (i.e., equal to or greater than its toughness) before assigning any damage to the next blocker.
- Blockers: Each blocking creature deals combat damage equal to its power to the creature it is blocking.
Simultaneous Damage: All combat damage is dealt simultaneously. This is crucial because it means that creatures can be destroyed by combat damage and still deal their own combat damage.

Noncombat Damage

Noncombat damage is any damage dealt outside of the combat phase, typically by spells and abilities. For example, a spell like Lightning Bolt deals 3 damage to any target. This damage bypasses the combat rules and is dealt directly to the target. Noncombat damage can also originate from triggered abilities, activated abilities, or static abilities.

Damage Prevention and Redirection

Damage prevention and redirection effects can significantly alter the outcome of damage calculation.

Damage Prevention: These effects reduce or prevent damage. For example, a card like Fog prevents all combat damage that would be dealt this turn. Prevention effects apply before damage is dealt.
Damage Redirection: These effects change the target of the damage. For example, a card like Deflecting Palm redirects damage that would be dealt to you to another target. Redirection effects apply before damage is dealt to the original target.

Lethal Damage and State-Based Actions

A creature is destroyed when it has been dealt damage equal to or greater than its toughness. A planeswalker is destroyed when its loyalty reaches zero. A player loses the game when their life total reaches zero or less.

These conditions are checked as state-based actions, which are checked before any player would receive priority. This means that if a creature takes lethal damage, it will be destroyed before a player can cast a spell or activate an ability in response.

Damage on Planeswalkers

Damage dealt to a planeswalker is treated specially. If a noncombat spell or ability would deal damage to a player, that player may redirect that damage to a planeswalker they control. This redirection is a choice the player makes as the spell or ability resolves. Combat damage can only be dealt to planeswalkers if they are being attacked.

Frequently Asked Questions (FAQs) about Damage Calculation

Here are 15 frequently asked questions regarding damage calculation in Magic: The Gathering, designed to cover a broad spectrum of scenarios and rules complexities.

What happens if a creature with deathtouch deals damage?

A creature with deathtouch only needs to deal 1 damage to destroy a creature. The remaining damage is still considered dealt but doesn’t affect the outcome for that creature.
How does trample interact with damage calculation?

If an attacking creature with trample is blocked, it must assign lethal damage to all blockers before assigning any damage to the defending player or planeswalker. Lethal damage is defined as damage equal to the blocker’s toughness, unless the attacking creature has deathtouch, in which case one damage is sufficient. Any remaining damage is then dealt to the player or planeswalker.
What if a creature has indestructible?

Creatures with indestructible cannot be destroyed by damage. Even if they are dealt damage equal to or greater than their toughness, they remain on the battlefield. However, they can still be exiled or sacrificed.
Can I prevent damage after it has already been dealt?

No, you cannot prevent damage after it has already been dealt. Damage prevention effects must be in place before the damage is dealt.
If I block a creature with first strike, will my creature deal damage back?

If a creature with first strike deals combat damage, and that damage is enough to destroy the blocking creature, the blocking creature will not deal combat damage back during the normal combat damage step. However, if the blocker survives the first strike damage, it will deal combat damage during the normal combat damage step.
What is lifelink, and how does it affect damage calculation?

Lifelink means that whenever a creature with lifelink deals damage, its controller also gains that much life. The damage is dealt as normal, and the life gain is a separate effect that triggers from the damage being dealt.
How does damage work with multiple blockers?

When an attacking creature is blocked by multiple creatures, the attacking player assigns damage to the blockers in an order they choose. They must assign lethal damage to the first blocker in the order before assigning any damage to the next blocker.
Can I redirect damage from a planeswalker to a creature?

No, you cannot redirect damage from a planeswalker to a creature. Damage can only be redirected from a player to a planeswalker they control (for noncombat damage from spells/abilities) or from a creature/player to another creature/player if an effect specifically allows it.
If a creature’s power is reduced to zero, does it still deal damage?

A creature with zero power deals zero damage. If its power is negative, it still deals zero damage.
How does protection work with damage?

A permanent with protection from a quality (e.g., protection from red) cannot be damaged by sources with that quality. It also cannot be targeted, enchanted/equipped, or blocked by sources with that quality.
What happens if a creature deals damage to itself?

A creature can deal damage to itself if an effect causes it to. The damage is calculated normally, and the creature will be destroyed if it has been dealt damage equal to or greater than its toughness.
Can I regenerate a creature after it has already been dealt lethal damage?

Yes, you can activate a regeneration ability in response to a creature being dealt lethal damage. Regeneration replaces the creature being destroyed; instead, it is removed from combat (if applicable), all damage is removed from it, and it becomes tapped.
How is commander damage calculated?

Commander damage is calculated by tracking how much combat damage a particular commander has dealt to a specific player over the course of the game. If a player has been dealt 21 or more combat damage by the same commander, they lose the game.
Does infect change how damage is calculated?

Yes, infect changes how damage is calculated. Creatures with infect deal damage to creatures in the form of -1/-1 counters and to players in the form of poison counters. Players lose the game when they have 10 or more poison counters. Damage from a source with infect is not life loss.
What happens if a source deals damage with both lifelink and infect?

When a source deals damage with both lifelink and infect, it deals damage in the form of -1/-1 counters or poison counters, and the controller of the source gains life equal to the amount of damage dealt.