Centaur Chieftain (EMA) from Eternal Masters, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Justin Sweet
• Card Text:
  Haste.
  Threshold — As long as seven or more cards are in your graveyard, Centaur Chieftain has "When Centaur Chieftain comes into play, creatures you control get +1/+1 and gain trample until end of turn."