702.145b

Daybound is found on the front faces of some transforming double-faced cards and represents three static abilities. “Daybound” means “If it is night and this permanent is represented by a transforming 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 728, “Day and Night.”