Talascourge, Jaws Of Death

As an extra cost to triggering this ability exile a creature card you control. When your opponent declairs attackers, destroy all those attackers, you
gain life equal to one of those creature's power,
your opponent loses life equal to that creature's
toughness. When this ability resigns, exile a
creature card you control.
"I hold the power of darkness; so much power,
I . . . feel it, it echoes through my body like the drums
to the gates of doom."