Laputa, Castle in the Sky

{1}, {t}: Add two mana of any color to your mana pool.
Any of your opponent may pay {1} and untap
this land during his or her turn. If he or she does, that opponent creates a colorless artifact token named Gold with "Sacrifice this artifact:
Add one mana of any color to your mana pool."
"Laputa will live. I will return it to life! Laputa's power is the dream of all mankind!" --Colonel Muska