Frenzied Cockatrice

Flying,
{3}{r/g}{r/g}{r/g}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When Frenzied Cockatrice becomes monstrous,Frenzied Cockatrice deals damage equal to its power to target creature you do not control.