732.1. Action is a Permissive keyword.
732.1.a. It can be present on Spells , Units , Rune Abilities, Legend Abilities or Permanent Abilities.
732.1.b. Action grants the corresponding card or effect permission to be played or activated during Showdowns, even when it is not the Controlling player's turn.
732.1.c. Action is functionally short for the following:
732.1.c.1. On Spells and Units: "This can be played during showdowns on any player's turn."
732.1.c.2. On Rune, Legend, or Permanent Abilities: "This can be activated during showdowns on any player's turn."