Sage of Growth

Symbiosis (At the beginning of each opponent's upkeep, that player chooses a creature they control. Then, you may put a +1/+1 counter on that creature. If you do, put a +1/+1 counter on Sage of Growth.)
Whenever a +1/+1 counter on placed on a creature you don't control you gain 1 life.
"The forest is one with it's inhabitants. The inhabitants are one with the forest. And on Ravnica, there is no greate