Whenever a Werewolf you control enters, you may transform it. At the beginning of each upkeep, if a player cast two or more spells last turn, transform Vildin-Pack Alpha.
2016-04-08
If a creature with haste transforms and no longer has haste on the same turn that it comes under your control, such as if you cast a Geier Reach Bandit when you already control a Vildin-Pack Alpha, it won't be able to attack that turn.
2016-04-08
If you control three Vildin-Pack Alphas and a Werewolf enters the battlefield under your control, you may transform it, transform it again, and transform it a third time.
2016-04-08
The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn.
2016-04-08
To trigger the Werewolf's back face's transform ability, a single player must have cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.
2016-07-13
For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).