Emica, Army of One

At the beginning of your end step, if you control
twenty or more copies, you win the game.
When Emica enters the battlefield, put a +1/+1
counter on each creature you control with the
same name with another creature you control.
{3}{g}{u}, {t}: Create a token that's a copy of
target permanent, except it's not legendary if
that permanent is legendary.