Hi SMFrenzel,
maybe I can help you here.
To use the Daybound ability of the Howlpack Piper, The Celestus MUST be on the battlefield. Otherwise you won't be able to use it.
This is not correct.
Tovolar will only turn night in upkeep if you have at least 3 werewolfves or wolves.
If you have for example Tovolar and the Howlpack on the field, you can use her twice to bring in Ulrich and something else into the game.
This way you have two new creatures without casting anything at all, which means it will turn night the next upkeep and you can flip all werewolves and let ulrich fight another creature (if no one else played something in your turn, because old werewolves want transform then).
Also if you only have the howlpack on the battlefield you can use her as a
elvish piper which is pretty nice because you are not casting the creatures.
And as the old Werwolves didn't receive an errata, they do not react to Tovolar, Dire Overlord ....
As I find these cards in nearly every Tovolar deck: Am I wrong, or why are they used ?
Tovolar miracle text:
24.09.2021 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.
See:
https://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=535043Important part is ...Then transform any number of Human werewolves you control. This is for your old werewolves.
I hope I could help you with this informations.