If you cast a spell with daybound during night, that spell will be front face up (that is, daybound face up) on the stack. However, it will enter the battlefield with its back face up (that is, with its nightbound face up). It won't enter with its daybound face up and then transform.
Hound Tamer // Untamed Pup
Before a player untaps their permanents during the untap step, the game checks to see if the day/night designation should change.
If it is night, permanents with daybound that enter the battlefield without being cast will enter with their nightbound faces up.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Randy Vargas
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