Evyrr, Cold-Hearted Silencer

Menace, deathtouch
Whenever Evyrr attacks, tap target creature
defending player controls, it doesn't untap
during it's controllers next untap step, and it
gains "At the beginning of your upkeep, as long
as this creature is tapped, put a -1/-1 counter on
this creature."
{b}{g}, Sacrifice another tapped creature: Destroy
target tapped creature.