The Reaper, King No More
From Lorwyn Eclipsed Commander set
The Reaper, King No More
Legendary Artifact Creature — Scarecrow
3/3
When The Reaper enters, put a -1/-1 counter on each of up to two target creatures.
Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may put that card onto the battlefield under your control. Do this only once each turn.