Whitesnake

{1}{w/b}Theft—Exile target nonland permanent an opponent controls and put it in your hand. It may be cast using mana as if it were mana of any color. Only use once per turn.

You may hand a stolen card to an opponent. They have to pay 1 life as an additional cost to cast. As long as an opponent controls a stolen card, creatures, spells and abilities they control cannot target you or creatures you control.