The Combat Phase: A Complete Breakdown

The combat phase is where Magic: The Gathering games are most often decided — and most often misplayed. It operates under a precise sequence of five steps, each with its own timing rules and windows for players to act. Understanding exactly when creatures deal damage, when players can cast spells, and how blocking is resolved determines the difference between winning a race and losing a creature for nothing.

Definition and scope

The combat phase is one of five phases in a Magic turn (Magic: The Gathering Comprehensive Rules, Rule 500), sitting between the main phases. It governs how attacking and blocking creatures interact, when damage is assigned, and when combat-relevant triggered abilities fire. It is, structurally, one of the most rule-dense phases in the game — containing 5 distinct steps, multiple priority windows, and a damage assignment system that has changed at least once in the game's history (the shift to "first strike and regular damage" operating on separate combat damage steps was codified in the modern Comprehensive Rules framework).

Crucially, the combat phase is mandatory in the sense that it always occurs — but an attacking player is never forced to attack with any creature. Declaring zero attackers is a legal choice.

How it works

The combat phase follows a strict five-step sequence. Every step allows players to receive priority and cast instants or activate abilities (with one notable exception).

1. Beginning of Combat step — The turn comes to combat. Both players receive priority. This is the last window to act before attackers are declared. Removal cast here kills a potential attacker before it can swing.

2. Declare Attackers step — The active player declares which untapped creatures are attacking, and which player or planeswalker each is attacking. Creatures become tapped (unless they have Vigilance). Triggered abilities — including those on creatures with "attacks" triggers — go on the stack here. For a deeper look at how triggered abilities function, see Triggered, Activated, and Static Abilities.

3. Declare Blockers step — The defending player assigns blockers. Each blocking creature must be able to legally block (no flying blocker without reach or flying, no protection mismatch). If multiple creatures block a single attacker, the attacker's controller assigns the damage order among those blockers.

4. Combat Damage step — All combat damage is assigned simultaneously and dealt simultaneously (absent first strike or double strike). Creatures with first strike deal damage in a separate combat damage step that precedes this one; creatures with double strike deal damage in both steps. This is not a minor distinction — a 2/2 with first strike kills a 2/2 without it and survives.

5. End of Combat step — Triggered abilities that read "at end of combat" fire here. "Until end of combat" effects expire. Priority is passed once more before the phase ends.

The Stack and Priority page covers how spells and abilities queue during these windows — relevant because every step except Declare Blockers includes a priority window for responses.

Common scenarios

Blocking to trade versus blocking to survive. A 3/3 blocking a 4/4 results in both dying. A 1/4 blocking a 4/4 survives (the 1/4 has 4 toughness; it absorbs exactly 4 damage, its toughness threshold). Recognizing which scenario applies before declaring blockers is one of the foundational decisions in Reading the Board State.

Double blocking to kill a large attacker. Two creatures — a 2/2 and a 3/3 — can kill a 4/5 attacker if the attacker's controller orders the damage to fully kill one before assigning lethal to the other. With damage ordering, the attacker must assign at least lethal damage (4) to the first creature in order before putting any on the second. So: assign 2 to the 2/2 (not lethal), assign 2 to the 3/3 (not lethal) — this is illegal. The first blocker in the order must receive lethal damage first.

Combat tricks. Instant-speed pump spells change the math after blockers are declared. A 2/2 that becomes a 4/4 via Giant Growth at instant speed survives combat with a 3/3 and deals 4 damage. The window after Declare Blockers and before Combat Damage is the most common slot for these.

Decision boundaries

The largest decision boundary in combat is the one that happens before any creatures move: choosing whether to attack at all. Aggression in Magic is asymmetric — the attacking player exposes creatures to blocks and removal, while the defending player can hold blockers back as deterrents. This tension underpins the entire Deck Archetypes: Aggro, Control, Combo, and Midrange taxonomy. Aggro strategies exploit the opponent's need to answer multiple threats; control strategies use the combat phase as bait for sweepers.

The second major decision boundary is the Declare Attackers step versus the Beginning of Combat step. An opponent with an untapped creature and mana open might have a combat trick or instant-speed removal. Acting during the Beginning of Combat step — killing a key creature before it attacks — removes that ambiguity at the cost of giving up information. Waiting until after Declare Attackers is declared gives more information but fewer options.

A third boundary sits at damage assignment order when multiple creatures block one attacker. The choice of ordering is locked in before damage is dealt and cannot be changed after the fact — making it an irreversible commitment, not a guess.

Everything that happens in combat ultimately feeds back into the larger question of the game state. The Magic: The Gathering Authority home covers the full scope of rules, formats, and strategy topics that provide the surrounding context for why combat decisions carry such consistent weight.