Horrifying Revelation — ruling 1

If the player has no cards in their hand or no cards in their library, the other effect still happens.

Horrifying Revelation : règles, fonctionnement et interactions (MTG)

Horrifying Revelation 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 discards a card, then mills a card.

How it works : Horrifying Revelation

Original English text — Wizards of the Coast / Scryfall

#1June 1, 2011· Wizards of the Coast
If the player has no cards in their hand or no cards in their library, the other effect still happens.
No other card is named in this ruling.