When moving a character into a battlefield to start a showdown, can the designated attacker play an action card (like Facebreaker) before their opponent gets priority?

Ruling: When you move into a battlefield and showdown starts, the designated attacker has first priority and can play action cards before their opponent.

Sequence:

• Move units into battlefield, starting showdown
• Designated attacker has first priority and can play actions (e.g., Facebreaker)
• Opponent can respond with their own actions if able
• Chain resolves in reverse order (last played resolves first)
• After each effect resolves, the owner of the next effect on the chain gets priority
• If both players pass consecutively, the next effect resolves

Nuances:

• Hidden cards can be played at action speed into the chain
• If a card is not hidden, it cannot be played at action speed in response to another action
• If a target becomes invalid (e.g., moved by another effect), the action will not find its target when it resolves