Reaper's Scythe 

Artifact — Equipment
Job select
At the beginning of your end step, put a soul counter on this Equipment for each player who lost life this turn.
Equipped creature gets +1/+1 for each soul counter on this Equipment and is an Assassin in addition to its other types.
Death Sickle — Equip {2}
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Cards that do something similar expected a card that isn't here?
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Malefic Scythe 90%
$0.11#18399
"Equipped creature gets +1/+1 for each soul counter on this Equipment."
+1 more matching line
Gavel of the Righteous 81%
$0.28#5486
"Equipped creature gets +1/+1 for each counter on this Equipment."
Rakdos Riteknife 80%
$0.58#24451
"Equipped creature gets +1/+0 for each blood counter on this Equipment and has "{T}, Sacrifice a creature: Put a blood counter on this card.""
+1 more matching line