Jester's Cap — ruling 1

As long as there are three or more cards in that library, you must find three cards and exile them. If there are fewer than three cards in the player's library, you exile all of them.

Jester's Cap : règles, fonctionnement et interactions (MTG)

Jester's Cap 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

, , Sacrifice this artifact: Search target player's library for three cards and exile them. Then that player shuffles.

How it works : Jester's Cap

Original English text — Wizards of the Coast / Scryfall

#1December 8, 2022· Wizards of the Coast
As long as there are three or more cards in that library, you must find three cards and exile them. If there are fewer than three cards in the player's library, you exile all of them.
No other card is named in this ruling.