+1: Add {G}{G}. Use this mana only to cast green spells. If you cast a creature with this mana, put a trample counter on it.

-3: Put a +1/+1 counter on each creature you control with trample.

-8: Create 10 1/1 green Saproling creature tokens. Put a trample counter and 4 +1/+1 counters on all of them.