Yuko, Convoy Seeker

{2}{g}, {t}: Each player puts the top three cards of
their library into their graveyard. Exile up to two creature cards put into graveyards this way.
Create an X/X green Chameleon creature token,
where X is the total power of the cards exiled
this way.
At the beginning of your end step, Populate.
{2}{g}{g}: Regenerate Yuko, Convoy Seeker.