Historical Rules · 29 September 2017
Rule 607.2f
Official source text from the 29 September 2017 Rules release
If an object has an ability printed on it that causes a player to pay a cost as it enters the battlefield and an ability printed on it that refers to the cost paid “as [this object] entered the battlefield,” these abilities are linked. The second ability refers only to a cost paid as a result of the first ability.