Undead Servant

Enslaved ( If a creature with Servitor is in play, this creature must attack and block with that creature)
Hypnosis ( When creatures block this card, that creatures controller must tap a land or give you control of a creature they control. Land tapped this way doesn't untap unless it's controller pays 1 mana of any color to untap it. Creatures lost this way don't return unless their controller pays their mana cost again)