Yulana, Matron of Broods

Whenever one or more Beast, Elk, Wolf, Dog, Saproling, or Insects enter the battlefield under
your control, you get an experience counter.
{2}{g}{g}, {t}: Choose Beast, Elk, Wolf, Dog,
Saproling, or Insect. Create a */* green creature
token of the chosen type with "This creature's
power and toughness are equal to the number of experience counters you have." Then you
gain life equal to that creature's power.