Creature — Human Werewolf
2 / 1
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
Creature — Werewolf
4 / 2
Trample
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.
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.