Contract of Flames

If you control a Mountain, you may cast this card
without paying its mana cost. If you do, choose
an opponent as this spell resolves and exile this
card. For as long as it remains exiled, that
player may cast it without paying its mana cost.
Copy target instant or sorcery spell you control
twice, then exile it. You may choose new targets
for the copies. (That spell won't resolve.)