Nessian Asp (THS) from Theros, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Alex Horley-Orlandelli
• Card Text:
  Reach
  6G: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)