Kurse, Lord of Darkness

Combat damage dealt by Kurse causes you to
gain that much life
Kurse enters the battlefield tapped and does not
untap during your untapped step
Sacrifice 2 permanents: untap Kurse
{t} Sacrifice 2 permanents: Kurse deals 4 damage
to all non black creatures
Vulnerable to white (this creature takes double
damage from all white sources)
Black spells cost {b} less to cast
White spells cost {2} more to cast