Crackling Perimeter — ruling 1

You can't tap an untapped Gate you control for mana and tap it to activate Crackling Perimeter's ability at the same time. You must choose one or the other.

Crackling Perimeter : règles, fonctionnement et interactions (MTG)

Crackling Perimeter 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

Tap an untapped Gate you control: This enchantment deals 1 damage to each opponent.

How it works : Crackling Perimeter

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2013· Wizards of the Coast
You can't tap an untapped Gate you control for mana and tap it to activate Crackling Perimeter's ability at the same time. You must choose one or the other.
No other card is named in this ruling.