Gatstaf Shepherd // Gatstaf Howler (ISD-182) - Innistrad: (Double Faced Transform)

At the beginning of each upkeep, if no spells were cast last turn, transform Gatstaf Shepherd.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
At the beginning of each upkeep, if a player cast two or more spells last turn, transform Gatstaf Howler.