Rules glossary
↑ Parent rule: 702.145 Daybound and Nightbound
702.145b Daybound is found on the front faces of some double-faced cards and represents three static abilities. “Daybound” means “If it is night and this permanent is represented by a double-faced card, it enters transformed,” “As it becomes night, if this permanent is front face up, transform it,” and “This permanent can’t transform except due to its daybound ability.” See rule 731, “Day and Night.”
No sub-rules.