Skittering Crustacean
{2}{U}
Creature -- Crab
2/3
{6}{U}: Monstrosity 4. (If ~this~ isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)
As long as ~this~ is monstrous, it has hexproof. (It can't be the target of spells or abilities your opponents control.)