Primalcrux

Creature — Elemental

Trample
Chroma — Primalcrux's power and toughness are each equal to the number of green mana symbols in the mana costs of permanents you control.

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2008-08-01:
This will count the number of symbols in its mana cost while it’s on the battlefield. The ability functions while it’s in other zones, but since it isn’t a permanent while in those zones it won’t count itself.
2008-08-01:
Chroma abilities check only mana costs, which are found in a card’s upper right corner. They don’t count mana symbols that appear in a card’s text box.
2008-08-01:
Chroma abilities count hybrid mana symbols of the appropriate color. For example, a card with mana cost {3}{U/R}{U/R} has two red mana symbols in its mana cost.