Gatstaf Arsonists
Creature — Human Werewolf
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
The glow in their eyes reveals more than anger or madness.
Gatstaf Ravagers
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Creature — WerewolfMenace (This creature can't be blocked except by two or more creatures.)
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.
Greg Staples
Shadows over Innistrad (SOI)
• #158Rulings
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.
(wotc • 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.
(wotc • 2016-04-08)
Rulings
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.
(wotc • 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.
(wotc • 2016-04-08)