Mylena, Sister of the Groves

When Mylena, Sister of the Groves enters the battlefield, put a +1/+1 counter on each creature you control.
When Mylena, Sister of the Groves leaves the battlefield, create a number of 1/1green Saproling creature tokens equal to its toughness, then put a number of +1/+1 counters on each Saproling equal to Mylena's power.