Vibrant Oversoul

Enchant creature.
Enchanted creature gains +1/+1 for each land you control in your mana pool. It cannot be the target of colored spells or abilities and is vulnerable only to colorless.
The most vibrant souls, are also the most powerful. Such unique souls can bond with the very soul of the land, with the souls of the elements themselves, and with the soul of the very universe. Such power can't be contained in the body, it has to be unleashed somehow.