Historical Rules · 25 January 2019
Rule 603.6d
Official source text from the 25 January 2019 Rules release
Some permanents have text that reads "[This permanent] enters the battlefield with . . . ," "As [this permanent] enters the battlefield . . . ," "[This permanent] enters the battlefield as . . . ," or "[This permanent] enters the battlefield tapped." Such text is a static ability-not a triggered ability-whose effect occurs as part of the event that puts the permanent onto the battlefield.