Compendium of Mind Control

{3}, {t}: Choose a creature type, then target opponent reveals his or her hand. That player chooses a creature of the chosen type. Put that creature on the battlefield under your control. Activate this ability only any time you could cast a sorcery.
{6}, {t}: Gain control of target creature.
It teaches how to take over any sort of living being. But it takes time to truly unlock it's potential.