Memoricide — ruling 1

Because you’re searching for “any number” of cards with the chosen name, you can opt to find all of them, none of them, or any number in between. That means you may leave any cards with that name in that target’s graveyard, hand, and/or library.

Memoricide : règles, fonctionnement et interactions (MTG)

Memoricide 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

Choose a nonland card name. Search target player's graveyard, hand, and library for any number of cards with that name and exile them. Then that player shuffles.

How it works : Memoricide

Original English text — Wizards of the Coast / Scryfall

#1January 1, 2011· Wizards of the Coast
Because you’re searching for “any number” of cards with the chosen name, you can opt to find all of them, none of them, or any number in between. That means you may leave any cards with that name in that target’s graveyard, hand, and/or library.
No other card is named in this ruling.