Last Updated: 2026-03-30

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813. Reaction

813.1. Reaction is a Permissive keyword.
813.2. The corresponding card or effect with this keyword is not restricted to Closed States or Showdowns. This permission is inclusive of all other timings and options available to the ability as written, Action's permissions, or by default.
813.3. Reaction does not alter the function of any instruction of the Card, Rune, or Effect it is on. It is only Permission.
813.4. Some passive abilities may grant a card or ability Reaction under certain conditions. The card or ability does not have the Reaction keyword unless and until those circumstances are true.
813.5. Reaction is a referencable characteristic.
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