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316.2. The Action Phase has no deļ¬ned structure.
316.2.a. A player may take any number of Discretionary Actions they are able to perform during this phase. See_rule_REF_398.1_DOT Discretionary Actions for more information.
316.2.b. This is denoted as a Neutral Open State , and only the Turn Player has the ability to play spells or activate abilities. See rule 307. States of the Turn for more information.
316.2.b.1. In Modes of Play with teammates, the Turn Player's teammates may play spells and activate abilities, including ones without Action or Reaction.