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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.

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.

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.

The second ability of Tovolar, Dire Overlord seems a little strange because Tovolar and other Human Werewolf creatures in this set transform when it becomes night anyway. Tovolar, however, isn't content to transform Werewolf creatures from just one set. This ability will allow you to transform Human Werewolf creatures from previous visits to Innistrad as well.

If it is night, and the active player of the previous turn cast two or more spells during their turn, it becomes day.

The first ability of each of Tovolar's faces triggers once for each Wolf or Werewolf you control that deals combat damage to a player. For example, if you attack with three Wolf creatures and they all deal combat damage to a player, the ability triggers three times.