Curse of Gluttony

Enchant land
Whenever enchanted land is tapped for mana,
put X glutton counters on it. Then add X mana
of any color to your mana pool. This mana
doesn't empty from your mana pool.
When Enchanted land has 6 glutton counters on
it, destroy it and return Cruse of Gluttony to the battlefield, transformed under it's owner's
control.