Immerwolf

Oracle Text

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Each other creature you control that's a Wolf or a Werewolf gets +1/+1.

Non-Human Werewolves you control can't transform.

Card Rulings

1/22/2011 A creature that’s both a Wolf and a Werewolf gets the bonus only once.
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.