Verdant, the Enlightened

Verdant, the Enlightened can't be countered.
When Verdant enters the battlefield, put a
+1/+1 counter on each creature you control.
Whenever you cast a green or blue spell, create
an X/X green and blue Elemental creature token
with trample, where X is equal to that spell's
mana value, then proliferate. You may pay 2 life.
If you do, populate.