Endurance

Forestwalk, Vigilance, First Strike, Reach, Trample
When Endurance enters the battlefield, add {g}{g}{g}{g}{g}{g}{g}, you don't lose this mana as steps
and phases end.
Whenever you cast a green permanent spell, put a
+1/+1 counter on each green creature you control.
For each green creature you control, when a +1/+1 counter is put on a creature you control, put an additional +1/+1 counter as well.
Evoke - {g} Pay 6 life: Endurance phases out until
the next main phase.