Ma'Kai, Lord of the Pit

Fear, Shroud
When Ma'Kai, Lord of the Pit enters the battlefield, you may choose to lose any number
of health. If you do, gain control of any number
of creatures who's total toughness equals the
amount of life lost this way.
"When Ma'Kai first rose from the depths of the pit,
the world shuddered... and terror was born."