Anointed Peacekeeper

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

• WWizards of the Coast2022-09-09
  Official Ruling
  Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities (such as equip) are activated abilities and will have colons in their reminder text. Triggered abilities (starting with “when,” “whenever,” or “at”) are unaffected by the last ability of Anointed Peacekeeper.
• WWizards of the Coast2022-09-09
  Official Ruling
  You can choose any card name, even if that card doesn’t normally have an activated ability. You’re not limited to the names of cards you saw in the opponent’s hand.
• WWizards of the Coast2022-09-09
  Official Ruling
  An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate.
• WWizards of the Coast2022-09-09
  Official Ruling
  You can’t choose the name of a token unless that token has the same name as a card.
• WWizards of the Coast2022-09-09
  Official Ruling
  Anointed Peacekeeper’s last ability affects cards regardless of what zone they’re in. This includes cards in hands, cards in the graveyards, and exiled cards.
• WWizards of the Coast2022-09-09
  Official Ruling
  Anointed Peacekeeper’s third ability applies to all opponents, not just the opponent whose hand you looked at.

Rulings via Scryfall