Kaltain, Wielder of Shadowfire

Deathtouch, Lifelink, First Strike
You may cast cards from exile by paying {b}{b} or 1 life instead of paying its mana cost
{w}{t}: You gain life equal to the number of creatures that died this turn
{b}{b}{b}{b}{t}: destroy all other creatures. They cannot be regenerated. Exile all cards in all graveyards
{7}{w}{b}{b}{b}{b}{t}: exile all creatures you do not control and all planeswalkers you do not control
Kaltain unleashed the last of her shadowfire, and the world burned.