Feed on the Sap

Enchant land
When enchanted land becomes tapped, you may add one Mana of any color that this land can produce to your Mana pool, unless its controller pays 2 life. If he or she does, that land does not untap during its controller's next untap step. Mana added to your Mana pool this way lasts until your next end step.
"Pesky critters. Just you wait 'til I find my musket."