Possessed Nomad (TOR) from Torment, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Eric Peterson
• Card Text:
  Attacking doesn't cause Possessed Nomad to tap.
  Threshold — Possessed Nomad gets +1/+1, is black, and has "2B, T: Destroy target white creature." (You have threshold as long as seven or more cards are in your graveyard.)