Svent Ssej, the Silent Death

Deathtouch, Flying, Ward—Sacrifice a creature.
At the begining of your end step, put an acid
counter on each creature your opponents control.
Creatures get -1/-1 for each acid counter on them.
Whenever a creature an opponent controls with
an acid counter dies, create a treasure token.
Whenever Svent Ssej, the Silent Death deals
combat damage to an opponent, amass X trolls,
being X equal to the damage dealt to the opponent.