Skittering Crustacean (CN2) from Conspiracy: Take the Crown, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Jason Felix
• Card Text:
  6U: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)
  As long as Skittering Crustacean is monstrous, it has hexproof. (It can't be the target of spells or abilities your opponents control.)