Zhalfirin Commander (DDG) from Duel Decks: Knights vs. Dragons, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Stuart Griffin
• Card Text:
  Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
  1WW: Target Knight creature gets +1/+1 until end of turn.