Merieke, Matron of Desire

Merieke, Matron of Desire doesn't untap during
your untap step.
{w}{t}: Gain life equal to your devotion to white.
{4}{u}{t}: Counter target noncreature spell.
{b}{t}: Gain control of target creature for as long
as Merieke, Matron of Desire is tapped. Lose
life equal to its converted mana cost.