If it's neither day nor night, and a creature with daybound and a creature with nightbound somehow appear on the battlefield at the same time, it becomes day. The creature with nightbound will transform.
Outland Liberator // Frenzied Trapbreaker
If it is night, and the active player of the previous turn cast two or more spells during their turn, it becomes day.
Permanents with daybound and nightbound can't transform via any means other than their daybound and nightbound abilities. Notably, older cards such as Moonmist that instruct a player to transform permanents don't affect permanents with daybound or nightbound.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Brigitte Roka
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
