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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.

Mill

For a player to mill a number of cards, that player puts that many cards from the top of their library into their graveyard.

A player can’t mill a number of cards greater than the number of cards in their library. If given the choice to do so, they can’t choose to take that action. If instructed to do so, they mill as many as possible. Similarly, the player can’t pay a cost that includes milling a number of cards greater than the number of cards in their library.

Dredge is a static ability that functions only while the card with dredge is in a player’s graveyard. “Dredge N” means “As long as you have at least N cards in your library, if you would draw a card, you may instead mill N cards and return this card from your graveyard to your hand.”

A player with fewer cards in their library than the number required by a dredge ability can’t mill any of them this way.

If a trigger event includes an object moving out of or into a player’s range of influence, use the game state before or after the event as appropriate to determine whether the triggered ability will trigger. See rules 603.6 and 603.10.

You can only play the top cards of players’ libraries when you are the planar controller. Generally, this means as long as it’s your turn. When another player begins their turn, that player becomes the planar controller and can play the top card of players’ libraries. You won’t be able to until you again become the planar controller.

If the top card of a player’s library is a land card, you may play it only if you haven’t played a land yet that turn.

Other players won’t be able to play the top card of their libraries unless another effect allows it. If you and another player can play the top card of that player’s library (because of some other effect), you’ll be able to in most cases. This is because you have priority first at the beginning of each phase and step and after each spell or ability resolves. Once you play that card, it immediately moves from that library to the appropriate zone (the battlefield if it’s a land card or the stack if it’s a nonland card). The other player can’t respond by playing that card.

As soon as you finish playing the card on top of a player’s library, the next card in that library becomes revealed.

If a player draws multiple cards at once, they reveal each one before drawing it.

You may play the top card of any player’s library, including your own. This effect doesn’t change when you can play any of these cards (meaning play it if it’s a land card or cast it if it’s a nonland card). You can still cast creature spells only on your turn during your main phase and so on.