Plated Hydra

Plated Hydra enters the battlefield with five
+1/+1 counters on it.
Plated Hydra has obstruct X, where X is the
number of +1/+1 counters on it. (This creature
can block X additional creatures each combat.)
Whenever Plated Hydra blocks, remove a +1/+1
counter from it for each creature it blocked at
end of combat. Prevent all combat damage that
would be dealt to it.