Rootweaver Treefolk

Rootweaver Treefolk's power and toughness are
equal to the number of Forests you control.
Whenever a Forest enters the battlefield under
your control, put a growth counter on
Rootweaver Treefolk. Then, if it has three or
more growth counters on it, remove them and
create a 5/5 green Treefolk creature token with
trample.
"From the smallest seed, the mightiest will rise."