Your search for "warclamp mastiff 40" revealed the following:
Warclamp Mastiff (M13) from Magic 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: David Palumbo Card Text:First strike (This creature deals combat damage before creatures without first strike.)
Warclamp Mastiff (Foil) (M13) from Magic 2013, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: David Palumbo Card Text:First strike (This creature deals combat damage before creatures without first strike.)