Tenera de Silva

Lifelink, Reach, Trample
Tenera de Silva comes into play with X +1/+1 counters on it.
Whenever Tenera de Silva attacks, you may choose a color and add one mana of the chosen color to your mana pool per +1/+1 counters on Tenera de Silva.
{g}{g}: Put a +1/+1 counter on Tenera de Silva.
-The trees of the forest are his children.