Elyas, Oathsworn Avenger

When Elyas, Oathsworn Avenger enters the battlefield, choose any number of target
creatures. Put a vengeance counter on each of
those creatures.
Elyas gets -1/-1 for each creature with a
vengeance counter on it.
Deathtouch, menace
{b}{b}, sacrifice a creature: Destroy target creature
with a vengeance counter on it. Its controller
loses 3 life and discards a card.