Rule 614.13c

While applying a replacement effect that modifies how a permanent enters the battlefield, another replacement effect may cause a player to mill cards or exile cards from the top of a library. In that case, any card that is entering the battlefield from that library won’t be included in that effect, even though those cards are in the library as the effect is applied. Example: Ashiok, Wicked Manipulator has an ability that reads “If you would pay life while your library has at least that many cards in it, exile that many cards from the top of your library instead.” Breeding Pool is a land that reads, in part, “As this land enters, you may pay 2 life.” If an effect allows a player to play Breeding Pool from the top of their library while they control Ashiok, and they choose to pay life as Breeding Pool enters, Ashiok’s replacement effect will ignore Breeding Pool, because it is entering the battlefield, and the next two cards will be exiled.