Malcator, Purity Overseer — ruling 1

Malcator will count any artifacts that entered the battlefield under your control during the turn, even if you didn't control Malcator at the time. Malcator won't count non-artifact permanents you controlled that became artifacts.

Malcator, Purity Overseer : règles, fonctionnement et interactions (MTG)

Malcator, Purity Overseer 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

When Malcator enters, create a 3/3 colorless Phyrexian Golem artifact creature token. At the beginning of your end step, if three or more artifacts entered the battlefield under your control this turn, create a 3/3 colorless Phyrexian Golem artifact creature token.

How it works : Malcator, Purity Overseer

Original English text — Wizards of the Coast / Scryfall

#1February 4, 2023· Wizards of the Coast
Malcator will count any artifacts that entered the battlefield under your control during the turn, even if you didn't control Malcator at the time. Malcator won't count non-artifact permanents you controlled that became artifacts.
No other card is named in this ruling.