Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.

Petrify : règles, fonctionnement et interactions (MTG)

Petrify 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

Enchant artifact or creature Enchanted permanent can't attack or block, and its activated abilities can't be activated.

How it works : Petrify

Original English text — Wizards of the Coast / Scryfall

#1November 10, 2023· Wizards of the Coast
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.
No other card is named in this ruling.