Tovolar, Dire Overlord // Tovolar, the Midnight Scourge

If a creature you control that's a Wolf and a Werewolf deals combat damage to a player, the first ability triggers only once.

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.

If it is night, permanents with daybound that enter the battlefield without being cast will enter with their nightbound faces up.

If it is day, and the active player of the previous turn cast no spells during their turn, it becomes night.

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.

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.

Before a player untaps their permanents during the untap step, the game checks to see if the day/night designation should change.

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.