The legal and the illegal

When this enters the battlefield, add {b}{w}.
every turn, check if your devotion to black is more than seven. if true, add {b}{b}{b}{e}{e}{e}.
every turn, check if your devotion to white is more than seven. if true, add {w}{w}{w}{e}{e}{e}.
pay {e}{e}{e} with a devotion to {b}: tap all creatures but this and all tapped creatures get -1/-3.
pay {e}{e}{e} with a devotion to {w}: your opponent looses 3 lives. (enhanced from "Logic and mischief.")