Black Blade Maliketh

Double Strike, trample

Whenever Black Blade Maliketh attacks alone, you
may sacrifice a creature. If you do, untap it. There's
an additional combat phase after this one. Activate
this ability only once each turn.

At the beginning of your end step, Black Blade
Maliketh deals damage to each player equal to
the amount of combat damage he dealt to that
player this turn.