Khul'Nath, The Chained

Indestructible
{u}{u}{b}{b}, {t}: Sacrifice a creature you control.
Gain control of target creature an opponent
controls with mana value equal to or less than
the sacrificed creature's mana value.
{b}{b}{b}, {t}: Each opponent loses X life, where
X is the highest mana value among permanents
you don't control. You lose 5 life.
Pantheon