chooseAttackers

Sent during the declare-attackers step of combat. The engine tells the client which creatures are able to attack and which players, planeswalkers, or battles each one may attack — for example, choosing to swing with a Grizzly Bears at the opponent’s face while leaving an untapped blocker back.

Answered on the board

The reference client answers this prompt through interaction with the battlefield (not a modal dialog), so it has no standalone screenshot. The fields below are what the engine sends; the response is what the client returns once the player has acted.

Arguments

input.type is "chooseAttackers". The remaining fields:

TypeScript

interface ChooseAttackersInput {
  attackers: Array<AttackerOptionDto>;
  attackTargets: Array<AttackTargetDto>;
}

Rust

#[serde(rename_all = "camelCase")]
pub struct ChooseAttackersInput {
    pub attackers: Vec<AttackerOptionDto>,
    pub attack_targets: Vec<AttackTargetDto>,
}

References: AttackTargetDto , AttackerOptionDto

Response

type ChooseAttackersOutput = { type: "declareAttackers"; assignments: AttackAssignment[] };
type AttackAssignment = { attackerId: string; targetId: string };

Return one AttackAssignment per attacking creature: each assignment sends one creature at one target. Creatures the player chooses not to attack with are simply omitted.

Example

{
  "promptId": 7,
  "decidingPlayerId": "player-0",
  "input": {
    "type": "chooseAttackers",
    "attackers": [
      { "attackerId": "bf-3", "validTargetIds": ["player-1", "pw-1"] },
      { "attackerId": "bf-4", "validTargetIds": ["player-1", "pw-1"] }
    ],
    "attackTargets": [
      { "id": "player-1", "label": "Opponent", "kind": "player" },
      { "id": "pw-1", "label": "Jace, the Mind Sculptor", "kind": "planeswalker" }
    ]
  }
}

{
  "promptId": 7,
  "output": {
    "type": "declareAttackers",
    "assignments": [
      { "attackerId": "bf-3", "targetId": "player-1" },
      { "attackerId": "bf-4", "targetId": "pw-1" }
    ]
  }
}