CrabSwarm

When CrabSwarm enters the battlefield every crab creature gets +1/+1 until this card leaves the battle field.
For every 3 crab creatures on the battle field this card gets a +2/+2
"The crabs were fierce warriors on the battlefield, they could handle a one on one fight. But once they started to swarm,
they were unbeatable. We had to retreat,For my dad he
did not escape that monstrosity."
-Lobster Chieftain Rak