Ara, Voda of the World Tree

When Ara, Voda of the World Tree enters the battlefield if it was cast populate, populate,
populate. (Put a token onto the battlefield that's a
copy of a creature token you control.)
{g/w}{g/w}{g/w}{g/w},{t}: Create a green and white wurm creature token with trample and "this creatures
power and toughness are equal to the number of creatures you control".
{g/w}{g/w}{g/w}{g/w},{t}: Populate, populate.