Oracle

Instant 

Target creature gets +X/+X until end of turn, where X is your devotion to green. (Each G in the mana costs of permanents you control counts toward your devotion to green.)

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

9/15/2013
Numeric mana symbols (0, 1, and so on) in mana costs of permanents you control don’t count toward your devotion to any color.

9/15/2013
Mana symbols in the text boxes of permanents you control don’t count toward your devotion to any color.

9/15/2013
Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).

9/15/2013
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.

2/1/2014
The value of X is calculated as Aspect of Hydra resolves. The bonus won’t change later in the turn, even if your devotion to green does.

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