Ancient Lumberknot — ruling 1

Ancient Lumberknot's ability doesn't actually change any creature's power. It changes only the amount of combat damage the creature assigns. All other rules and effects that check power or toughness use the real values, even if they cause damage “equal to a creature's power” to be dealt.

Ancient Lumberknot : règles, fonctionnement et interactions (MTG)

Ancient Lumberknot 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

Each creature you control with toughness greater than its power assigns combat damage equal to its toughness rather than its power.

How it works : Ancient Lumberknot

Original English text — Wizards of the Coast / Scryfall

#1November 19, 2021· Wizards of the Coast
Ancient Lumberknot's ability doesn't actually change any creature's power. It changes only the amount of combat damage the creature assigns. All other rules and effects that check power or toughness use the real values, even if they cause damage “equal to a creature's power” to be dealt.
No other card is named in this ruling.