Forest Rancor

{6}{g}: Monstrosity 5. (If this creatures isn't monstrous, put 5 +1/+1 counters on it and it
becomes monstrous.)
If Forest Rancor is monstrous, it has Trample.
"The rancor is deadly and one of the most hideous
beasts I have ever encountered, best described as a
walking collection of fangs and claws, with no thought
other than to kill and eat."
— Mammon Hoole