Orim's Prayer — ruling 1

The ability only triggers when one or more creatures attack you. It will not trigger on creatures attacking a planeswalker you control.

Orim's Prayer : règles, fonctionnement et interactions (MTG)

Orim's Prayer 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

Whenever one or more creatures attack you, you gain 1 life for each attacking creature.

How it works : Orim's Prayer

Original English text — Wizards of the Coast / Scryfall

#1April 1, 2008· Wizards of the Coast
The ability only triggers when one or more creatures attack you. It will not trigger on creatures attacking a planeswalker you control.
No other card is named in this ruling.