Muscular, the Carnal Murderer

Trample
{g}{g} Muscular gets +1/+1
{1}{g}{w} Muscular gets +2/+2, activate only if Muscular has already an Counter on it.
{2}{w}{g} Muscular gets +3/+3, activate only if Muscular has at least three Counters on it.
{x}{w}{w} Muscular gets -x/-x. This can't
lower the initial power and toughness of Muscular.