Derflux, Knight of the Phoenix

Haste, Vigilance, Double Strike
{b}{r}: Derflux, Knight of the Phoenix fights target creature.
{t}{b}{r}: Gain control of target creature until end
of turn, it becomes a demon in addition to its
other types.
{t}{3}{b}: Exile target demon an opponent
controls, you may cast copy's of any creature
exiled this way.