Giant Crayfish

Giant Crayfish enters the battlefield with a +1/+1 counter on it.
Whenever Giant Crayfish attacks, you may
remove a +1/+1 counter from it. If you do, it
deals damage equal to its power to target creature defending player controls.
{4}{g}: Put a +1/+1 counter on Giant Crayfish.
Its spittle hath felled champions.