Seilah, Chill Moon Goddess

{t}: Gain control of target creature with power
less than or equal to your devotion to black
(Each {b} in the mana costs of permanents you
control counts towards your devotion to black.)
"I'll tell you one special characteristic about my curse
power. Once a person falls under my spell, I can take control over them at any time remotely. This means
that I could make your brother slit his own throat
right now, if I like."