Creature — Human Werewolf
5 / 4
At the beginning of each upkeep, if no spells were cast last turn, transform Gatstaf Arsonists.
Creature — Werewolf
6 / 5
Menace (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 Gatstaf Ravagers.
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).