Slaver

{ut}: Detain target creature with power 0 and toughness less than 3. Use this ability only as a sorcery. If the creature is successfully detained, gain one mana of a type produced by another player's land.
The slave is serviceable for the mere necessaries of life, so that clearly he needs only a small amount of virtue, in fact just enough to prevent him from failing in his tasks owing to intemperance and cowardice. -Aristotle