"The wilds are a garden tended by divine hands."

Karametra's Acolyte

{T}: Add an amount of {G} equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

Magic Online Promos

Theros

{T}: Add an amount of {G} to your mana pool equal to your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

Theros Promos

Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).

If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.

Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.

Numeric mana symbols ({0}, {1}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.

The activated ability is a mana ability. It doesn't use the stack and can't be responded to.