Melisandre, the Red Witch

Melisandre, the Red Witch enters the battlefield
under the control of an opponent of your choice.
Melisandre attacks each combat if able and can't
attack its owner or planeswalkers its owner
controls.
{3}: Melisandre's controller loses 2 life and you
draw a card. Any player may activate this ability.
(Xantcha, Sleeper Agent)