Day and night

Day and Night are designations that a game of Magic: The Gathering can have. These were introduced in Innistrad: Midnight Hunt.

Description

When the game starts, it's neither day nor night. In most games, it will become day first. The most common way that will happen is if a permanent with daybound appears on the battlefield. In some uncommon cases, it may become night first because a permanent with nightbound appears first.

Once it's day or night, the game will be exactly one of those designations, day or night, going back and forth until the game ends. It can never return to being neither. And the whole game is either day or night. It's not a per player thing.

If it's day, each double-faced card with daybound and nightbound will enter the battlefield with its daybound face up. If it's night, each of them will enter nightbound face up. Note that this doesn't affect spells on the stack.

There are two ways for the game's day/night designation to change. If it's day as a turn begins, and the previous turn's active player didn't cast a spell last turn, it becomes night. Similarly, if it's night as a turn begins, if the previous turn's active player cast two or more spells last turn, it becomes day. To help everyone keep track of day and night, a helper card that reminds you of these rules. Another way the day/night designation can change is when cards have effects that just say it becomes day or night. This can happen at any point in the turn when the effect says so.

As it becomes day, all double-faced cards with nightbound transform to their daybound faces. As it becomes night, all double-faced cards with daybound transform to their nightbound faces. In other words, these double-faced cards should always be in sync, no matter who controls them. What's more, permanents with daybound and nightbound can't transform any other way.

Helper card