Moonrager's Slash — ruling 1

The phrase "if it's night" refers to the day or night designation the game can have. It does not refer to whether or not it's dark outside as you play the game.

Moonrager's Slash : règles, fonctionnement et interactions (MTG)

Moonrager's Slash 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

This spell costs less to cast if it's night. Moonrager's Slash deals 3 damage to any target.

How it works : Moonrager's Slash

Original English text — Wizards of the Coast / Scryfall

#1September 24, 2021· Wizards of the Coast
The phrase "if it's night" refers to the day or night designation the game can have. It does not refer to whether or not it's dark outside as you play the game.
No other card is named in this ruling.