Planechase 2012 Edition "Planes" and "Phenomena" — Common
Plane — Ravnica
When you planeswalk to Kilnspire District or at the beginning of your precombat main phase, put a charge counter on Kilnspire District, then add to your mana pool for each charge counter on it.
Whenever you roll , you may pay . If you do, Kilnspire District deals X damage to target creature or player.