Howlpack Resurgence (SOI) from Shadows over Innistrad, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Izzy
• Card Text:
  Flash (You may cast this spell any time you could cast an instant.)
  Each creature you control that's a Wolf or a Werewolf gets +1/+1 and has trample.