Landroval, Horizon Witness

• WWizards of the Coast2023-06-16
  Official Ruling
  Two or more creatures you control must attack the same player in order for Landroval, Horizon Witness's ability to trigger. Creatures you control that attack planeswalkers that player controls or battles that player is protecting won't count toward Landroval, Horizon Witness's trigger condition.
• WWizards of the Coast2023-06-16
  Official Ruling
  In a multiplayer game, Landroval, Horizon Witness's triggered ability triggers once for each player you attack with at least two creatures.

Rulings via Scryfall