Immerwolf | Magic: The Gathering
Formats Immerwolf is Legal in
Official Oracle Text for Immerwolf
Each other creature you control that's a Wolf or a Werewolf gets +1/+1.
Non-Human Werewolves you control can't transform.
Official Rulings for Immerwolf
1/22/2011 : Immerwolf's bonus never applies to itself, even if it somehow becomes a Werewolf creature.
1/22/2011 : A "non-Human Werewolf" is a creature that is a Werewolf but is not a Human.