The Great Emancipator

+1: Tap any number of lands your opponent controls. For each land tapped this way, add one mana of any color that land could produce.
+1: Gain control of target Human Slave. It loses the "Slave" type. You may choose for it to lose any mana abilities and become a "Union Soldier."
-8: Target opponent gains an emblem with "Lands you control cannot be tapped for mana."