Kessig is a common Plane — Innistrad card from Planechase 2012 Planes (OPC2), collector number 21. Current market price: $3.28, TCGplayer market prices via Scryfall.
Prevent all combat damage that would be dealt by non-Werewolf creatures. Whenever chaos ensues, each creature you control gets +2/+2, gains trample, and becomes a Werewolf in addition to its other types until end of turn.