Tome Scour — ruling 1

If there are fewer than five cards in the targeted player’s library, that player puts all the cards from their library into their graveyard.

Tome Scour : règles, fonctionnement et interactions (MTG)

Tome Scour 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

Target player mills five cards.

How it works : Tome Scour

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
If there are fewer than five cards in the targeted player’s library, that player puts all the cards from their library into their graveyard.
No other card is named in this ruling.