Malefic Scythe 

Artifact — Equipment
$0.14 #18720 0.00 6.2 years
This Equipment enters with a soul counter on it.
Equipped creature gets +1/+1 for each soul counter on this Equipment.
Whenever equipped creature dies, put a soul counter on this Equipment.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Malefic Scythe expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Chainsaw90%
$1.04↑#3796↑0.18↑1.9 years↓
"Equipped creature gets +X/+0, where X is the number of rev counters on this Equipment."
+1 more matching line
Crowded Crypt78%
$0.42↑#2421↑0.054.9 years↓
"Whenever a creature you control dies, put a corpse counter on this artifact."
Sylvok Lifestaff77%
$0.19↑#22911↓0.0015.9 years↑
"Whenever equipped creature dies, you gain 3 life."
+2 more matching lines
Momentum77%
$0.20↑#28491↓0.0027.2 years↑
"At the beginning of your upkeep, you may put a growth counter on this Aura."
Quest for the Gravelord75%
$0.13↓#173050.0616.9 years↑
"Whenever a creature dies, you may put a quest counter on this enchantment."
Gristle Grinner74%
$0.10↓#28461↓0.50↑20.1 years↑
"Whenever a creature dies, this creature gets +2/+2 until end of turn."
Thraben Sentry // Thraben Militia74%
$0.12↓#28150↓0.0614.9 years↑
"Whenever another creature you control dies, you may transform this creature."
Jar of Eyeballs72%
$0.23↑#190320.0714.6 years↑
"Whenever a creature you control dies, put two eyeball counters on this artifact."
Reaper's Scythe72%
$0.23↑#7011↑0.13↑1.2 years↓
"Equipped creature gets +1/+1 for each soul counter on this Equipment and is an Assassin in addition to its other types."
+2 more matching lines
Transmogrant's Crown71%
$0.31↑#10941↑0.003.8 years↓
"Equipped creature gets +2/+0."
+1 more matching line
Lumberknot71%
$0.11↓#152840.25↑14.9 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial71%
$0.13↓#219150.0517.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental71%
$0.15↑#23966↓0.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Swarm of Bloodflies70%
$0.09↓#13737↑0.50↑11.9 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
+1 more matching line
Scavenger Drake70%
$0.18↑#222330.40↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rot Shambler70%
$0.17↑#13578↑0.0010.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob70%
$0.08↓#178580.0014.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."