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316.5. Showdowns
316.5.a. A Showdown occurs when a Combat occurs.
316.5.a.1. Showdowns that occur as a result of Combat are a Sub-Phase of Combat.
316.5.b. A Showdown is marked as Staged at a Battlefield when the Contested status is applied to a Battlefield with no current controller.
316.5.b.1. Showdowns that occur as a result of a player moving to an empty Battlefield are a stand-alone Phase and do not create a Combat.