Ratnagarba, Plane Undone

-3: Destroy target noncreature permanent. If it was a land, add 3 mana in any combination of colors to your mana pool.
0: Sacrifice any number of lands. Add X mana in any combination of colors to your mana pool, where X is twice the number of lands sacrificed.
-15: Destroy all lands. Add X mana in any combination of colors to your mana pool, where X is the number of lands destroyed this way.