Nature is God in all things

Indestructible, Protection from black and blue,
Echo {3}.
When this creature enters the battlefield,
create 2 3/3 green beast creature tokens.
At the beginning of combat on this and your
next turn, you may pay any amount of {g}.
Creatures you control gain +X/+X and trample
until end of turn, where X is the amount of {g} paid.