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Siege
MTGA Siege
Battle Type
(Subtype for battle cards)
Rules As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.
Statistics
36 cards
{C} 2.8% {W} 11.1% {U} 11.1% {B} 11.1% {R} 13.9% {G} 13.9% {W/U} 5.6% {U/B} 2.8% {B/R} 2.8% {R/G} 2.8% {G/W} 2.8% {W/B} 5.6% {U/R} 2.8% {B/G} 2.8% {R/W} 2.8% {G/U} 2.8% {M} 2.8%
as of March of the Machine
Scryfall Search
type:"Siege"
Invasion of Zendikar MOM

Siege is a type of Battle, introduced in March of the Machine.[1][2][3] Sieges are placed on your opponent’s side, and transform into something when you deal enough damage to it.[4]

Description[ | ]

A siege is a military blockade and assault of a city or fortress with the intent of conquering by force or attrition. A siege occurs when an attacker encounters a city or fortress that refuses to surrender and cannot be easily taken by a frontal assault.

Sieges have the reminder text "As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed."[5]

Every player except a battle's protector may attack it. Only a battle's protector may block creatures attacking it. Don't confuse protector for controller. You are able to attack battles that you control. This is the first time you've been able to attack your own permanents.

Any damage dealt to a battle causes that many defense counters to be removed from it. When the last defense counter is removed from a Siege battle, the battle is defeated and a triggered ability triggers. As this ability resolves, the battle's controller exiles it and then casts the back face from exile without paying a mana cost. The back faces are a variety of things; most of them are permanents, but there are also some sorceries.

Rules[ | ]

From the glossary of the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

Siege
A battle subtype. Only an opponent of a Siege’s controller can be its protector. When the last defense counter is removed, its controller exiles the Siege, then they may cast it transformed without paying its mana cost. See rule 310.11.

From the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

  • 310. Battles
    • 310.1. A player who has priority may cast a battle card from their hand during a main phase of their turn when the stack is empty. Casting a battle as a spell uses the stack. (See rule 601, “Casting Spells.”)
    • 310.2. When a battle spell resolves, its controller puts it onto the battlefield under their control.
    • 310.3. Battle subtypes are always a single word and are listed after a long dash: “Battle — Siege.” Battle subtypes are also called battle types. See rule 205.3q for the complete list of battle types.
    • 310.4. Defense is a characteristic that battles have.
      • 310.4a The defense of a battle card not on the battlefield is equal to the number printed in its lower right corner.
      • 310.4b A battle has the intrinsic ability “This permanent enters the battlefield with a number of defense counters on it equal to its printed defense number.” This ability creates a replacement effect (see rule 614.1c).
      • 310.4c The defense of a battle on the battlefield is equal to the number of defense counters on it.
    • 310.5. Battles can be attacked. (See rule 508, “Declare Attackers Step.”)
    • 310.6. Damage dealt to a battle results in that many defense counters being removed from it.
    • 310.7. If a battle’s defense is 0 and it isn’t the source of an ability which has triggered but not yet left the stack, it’s put into its owner’s graveyard. (This is a state-based action. See rule 704.)
    • 310.8. Each battle has a player designated as its protector.
      • 310.8a As a battle enters the battlefield, its controller chooses a player to be its protector. Which players may be chosen as its protector are determined by its battle type (see rule 310.11). If it has no battle types, its controller becomes its protector.
      • 310.8b A battle’s protector can never attack it. A battle can be attacked by any attacking player for whom its protector is a defending player. Notably, a Siege battle can be attacked by its own controller.
      • 310.8c A battle’s protector may block creatures attacking that battle with creatures they control. Creatures controlled by other players can’t block those attackers.
      • 310.8d If a battle’s protector is a different player than its controller, all rules and effects that refer to the “defending player” relative to a battle that is being attacked refer to that battle’s protector rather than its controller. See rule 508.5.
      • 310.8e If a rule or effect refers to the player who protects a battle, it means the player who is that battle’s protector.
      • 310.8f A battle can have only one protector at a time. A battle’s protector stops being its protector if another player becomes its protector.
      • 310.8g A battle’s protector doesn’t change if it stops being a battle or it becomes a copy of another battle.
    • 310.9. A battle can’t be attached to players or permanents, even if it is also an Aura, Equipment, or Fortification. If a battle is somehow attached to a permanent, it becomes unattached. This is a state-based action (see rule 704).
    • 310.10. If a battle that isn’t being attacked has no player designated as its protector, or its protector is a player who can’t be its protector based on its battle type, its controller chooses an appropriate player to be its protector. If no player can be chosen this way, the battle is put into its owner’s graveyard. This is a state-based action (see rule 704).
    • 310.11. All currently existing battles have the subtype Siege. Sieges are subject to special rules.
      • 310.11a As a Siege enters the battlefield, its controller must choose its protector from among their opponents. Only an opponent of a Siege’s controller can be its protector.
      • 310.11b Sieges have the intrinsic ability “When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost.”

Example[ | ]

Example

Invasion of Zendikar {3}{G}
Battle — Siege Defense3
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When Invasion of Zendikar enters the battlefield, search your library for up to two basic land cards, put them on the battlefield tapped, then shuffle.


Awakened Skyclave {CI_G}
Creature — Elemental
4/4
Vigilance, Haste.
As long as Awakened Skyclave is on the battlefield, it's a land in addition to its other types.
{T}: Add one mana of any color.

Rulings[ | ]

  • Battle is a new card type. Siege is a battle subtype. Sieges have some special rules that limit who can protect them, and they let their controller exile them and cast them transformed when they are defeated. All battles that currently exist are Sieges, but future battles may have different subtypes with different rules about who can protect them and what happens when they are defeated.
  • Sieges each have an intrinsic triggered ability. That ability is "When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost."
  • As a Siege enters the battlefield, its controller chooses an opponent to be its protector.
  • A Siege's controller can't be its protector. If a Siege's protector ever gains control of it, they choose a new player to be its protector. This is a state-based action.
  • If a non-battle permanent that is already on the battlefield become a copy of a Siege, its controller chooses one of their opponents to be that battle's protector. However, it will most likely be put into its owner's graveyard because it has no defense counters (see below).
  • A battle's "defense" is displayed in the bottom right corner of the card. A battle enters the battlefield with that number of defense counters. If another permanent enters the battlefield as a copy of a battle, it also enters with that number of defense counters.
  • Only creatures controlled by a battle's protector can block creatures that are attacking that battle. This means a Siege's controller can never assign creatures to block for it.
  • A battle can be dealt damage and be target of spells and/or abilities that target "any target."*
  • Damage dealt to a battle causes that many defense counters to be removed from it.
  • A battle can be attacked by all players other than its protector. Notably, this means a Siege's controller can attack it.
  • If a battle has no defense counters, and it isn't the source of a triggered ability that has triggered but not yet left the stack, that battle is put into its owner's graveyard. This is a state-based action. This doesn't cause a Siege's intrinsic triggered ability to trigger.
  • Notably, if a Siege never had defense counters on it (perhaps because a permanent became a copy of one), it can't have its last defense counter removed. It will be put into its owner's graveyard. You won't exile it or cast the other face.
  • If a token or a card that isn't represented by a transforming double-faced card becomes a copy of a Siege, it can't be cast as its triggered ability resolves. It will remain in exile. If it's a token, it will cease to exist the next time state-based actions are performed.
  • If a permanent that is represented by a transforming double-faced card becomes a copy of a Siege, it will be exiled as that Siege's triggered ability resolves, then it will be cast transformed. Note that this applies only to transforming double-faced cards, not to modal double-faced cards that can normally be played using either face.
  • In a multiplayer game, if the protector of a battle leaves the game and that battle is not currently being attacked, its controller chooses a new protector for it as a state-based action. If it is being attacked, its controller chooses a new protector for it once no creatures are attacking it. This means that it continues to be attacked and can be dealt combat damage as normal.
  • If a battle that's being attacked somehow stops being a battle, it is removed from combat. Similarly, if its controller changes in the middle of combat, it is removed from combat.
  • Battles can't attack or block, even if one also becomes a creature. If an attacking or blocking creature somehow becomes a battle in addition to being a creature, it is removed from combat.

References[ | ]

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