Burning Mountain

{t}: Add {r}. This Burning Mana.
(Some costs can only be paid with this. Burning
Mana stays in your mana pool until the end of the
turn.
At the start of at the end of the turn, your mana
pool empties any unused Burning Mana. This
does 1 point of damage to you for each point of
Burning mana that emptied this way. This damage
is as if from a Red source and cannot be prevented.)