Towering Thunderfist — ruling 1

You must activate Towering Thunderfist's ability before you declare attackers (at the latest, during the beginning of combat step) in order to have it attack without becoming tapped.

Towering Thunderfist : règles, fonctionnement et interactions (MTG)

Towering Thunderfist 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

: This creature gains vigilance until end of turn.

How it works : Towering Thunderfist

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2013· Wizards of the Coast
You must activate Towering Thunderfist's ability before you declare attackers (at the latest, during the beginning of combat step) in order to have it attack without becoming tapped.
No other card is named in this ruling.