Walking Ballista (Foil) (AER) from Aether Revolt, available at 401 Games Canada.

• Rarity: Rare
• Finish: Foil
• Artist: Daniel Ljunggren
• Card Text:
  Walking Ballista enters the battlefield with X +1/+1 counters on it.
  4: Put a +1/+1 counter on Walking Ballista.
  Remove a +1/+1 counter on Walking Ballista: It deals 1 damage to target creature or player.