Accursed Merfolk

Flash, flying, trample
Accursed Merfolk enters the battlefield with
X +1/+1 counters on it. If X is five or greater,
it can not be countered. When Accursed Merfolk enters the battlefield, it deals damage equal to
its power to target creature or planeswalker.
~Cursed for eating a Witchs pet, he became her pet.