2nd Planetary Devastation

This card deals X damage to each creature on
the battlefield. If you have already played Planatary Devastation either earlier this turn or during your
last turn, you don't have to pay X to play this card.
If you don't pay X, this card will deal damage to
every creature on the battlefield equal to X mana
used to play the first Planetary Devastation.

"Just what are you going to do about the second one,
Onoki?"