Norika Yamazaki, the Poet

• WOTC Official Reminder Textofficial rules
  Vigilance — Attacking doesn't cause this creature to tap.

• WWizards of the Coast2022-02-18
  Official Ruling
  A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step. For example, Norika Yamazaki's triggered ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.
• WWizards of the Coast2022-02-18
  Official Ruling
  You must still follow all normal timing rules and pay all costs for the enchantment card you cast this way.

Rulings via Scryfall