Landroval, Horizon Witness — ruling 1

In a multiplayer game, Landroval, Horizon Witness's triggered ability triggers once for each player you attack with at least two creatures.

Landroval, Horizon Witness — ruling 2

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.

Landroval, Horizon Witness : règles, fonctionnement et interactions (MTG)

Landroval, Horizon Witness is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flying Whenever two or more creatures you control attack a player, target attacking creature without flying gains flying until end of turn.

How it works : Landroval, Horizon Witness

Original English text — Wizards of the Coast / Scryfall

#1June 16, 2023· Wizards of the Coast
In a multiplayer game, Landroval, Horizon Witness's triggered ability triggers once for each player you attack with at least two creatures.
No other card is named in this ruling.
#2June 16, 2023· Wizards of the Coast
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.
No other card is named in this ruling.