Kessig Naturalist // Lord of the Ulvenwald
Creature — Human Werewolf // Creature — Werewolf
Rulings (9)
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.
Double-faced permanents with daybound transform to their nightbound faces as it becomes night. Similarly, double-faced permanents with nightbound transform to their daybound faces as it becomes day. This happens immediately and is not a state-based action. It happens any time it becomes day or night, not just during the untap step.
Before a player untaps their permanents during the untap step, the game checks to see if the day/night designation should change.
Legality
Formats by platform