Anafenza, Unyielding Lineage

• WOTC Official Reminder Textofficial rules
  Flash — You may cast this spell any time you could cast an instant.

• WWizards of the Coast2025-04-04
  Official Ruling
  If Anafenza dies at the same time as one or more other nontoken creatures you control, Anafenza’s last ability triggers for each of those other nontoken creatures.
• WWizards of the Coast2025-04-04
  Official Ruling
  If a noncreature permanent is instructed to endure, the effect is the same. You can put +1/+1 counters on that permanent or create a Spirit token.
• WWizards of the Coast2025-04-04
  Official Ruling
  You choose whether to put +1/+1 counters on the creature or create a Spirit token as the ability that includes the endure instruction is resolving. No player may take actions between the time you choose and the time that counters are added or tokens are created.
• WWizards of the Coast2025-04-04
  Official Ruling
  If you can’t put +1/+1 counters on the creature for any reason as an endure ability resolves (for example, if the creature is no longer on the battlefield), you’ll just create a Spirit token.

Rulings via Scryfall