Kessig

Plane — Innistrad   

Prevent all combat damage that would be dealt by non-Werewolf creatures. Whenever you roll , each creature you control gets +2/+2, gains trample, and becomes a Werewolf in addition to its other types until end of turn.

21 PC2 • ENAdam Paquette

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Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

6/1/2012
A "non-Werewolf creature" is a creature that doesn't have the Werewolf creature type. A creature with additional types, such as a Human Werewolf, is not a non-Werewolf creature.
6/1/2012
Creatures that you gain control of after the chaos ability resolves won't get any of that ability's bonuses.