Aura Thief

Flying
When this creature dies, you gain control of all enchantments. (You don't get to move Auras.)

The List

Urza's Destiny

Flying
When Aura Thief is put into a graveyard from play, you gain control of all enchantments. (You don't get to move local enchantments.)

Gaining control of an enchantment often isn’t very interesting since it probably won’t change what the enchantment is doing. It only matters if the enchantment does something specifically to “you” or “an opponent” or if the enchantment has an activated ability (which only the controller can use).