Madame Web, Clairvoyant — ruling 1

You must follow all normal timing rules when casting a spell this way.

Madame Web, Clairvoyant — ruling 2

Madame Web lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.

Madame Web, Clairvoyant — ruling 3

If the top card of your library changes while you're casting a spell, playing a land, activating an ability, or taking a special action, you can't look at the new top card until you finish doing so. This means that if you cast the top card of your library, you can't look at the next one until you're done paying for that spell.

Madame Web, Clairvoyant : règles, fonctionnement et interactions (MTG)

Madame Web, Clairvoyant 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

You may look at the top card of your library any time. You may cast Spider spells and noncreature spells from the top of your library. Whenever you attack, you may mill a card. (You may put the top card of your library into your graveyard.)

How it works : Madame Web, Clairvoyant

Original English text — Wizards of the Coast / Scryfall

#1September 19, 2025· Wizards of the Coast
You must follow all normal timing rules when casting a spell this way.
No other card is named in this ruling.
#2September 19, 2025· Wizards of the Coast
Madame Web lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
No other card is named in this ruling.
#3September 19, 2025· Wizards of the Coast
If the top card of your library changes while you're casting a spell, playing a land, activating an ability, or taking a special action, you can't look at the new top card until you finish doing so. This means that if you cast the top card of your library, you can't look at the next one until you're done paying for that spell.
No other card is named in this ruling.