Yoto Hime, The Demon Sword

Menace
{b}, Sacrifice a creature:
Yoto Hime gets X +1+1 counters where X
is equal to the power of the sacrificed creature.
{r}{t}, Yoto Hime deals damage equal to her
power to any target. If a creature dies this way
Yoto Hime gets X +1+1 counters where X is
equal to that creatures toughness