Malefic Scythe 

Artifact — Equipment
$0.14 #19027 0.00 6.3 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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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%
$1.22↑#3795↑0.26↑2.1 years↓
"Equipped creature gets +X/+0, where X is the number of rev counters on this Equipment."
+1 more matching line
Crowded Crypt78%
$0.39↑#2427↑0.19↑5.1 years↓
"Whenever a creature you control dies, put a corpse counter on this artifact."
Gardenize78%
$1.07↑#14343↑0.40↑0.0 years↓
"Whenever a creature you control dies, put a charge counter on this enchantment."
Sylvok Lifestaff77%
$0.18↑#23173↓0.0016.1 years↑
"Whenever equipped creature dies, you gain 3 life."
+2 more matching lines
Momentum77%
$0.22↑#29066↓0.17↑27.4 years↑
"At the beginning of your upkeep, you may put a growth counter on this Aura."
Quest for the Gravelord75%
$0.12↓#175710.0017.0 years↑
"Whenever a creature dies, you may put a quest counter on this enchantment."
Gristle Grinner74%
$0.19↑#28790↓0.0020.2 years↑
"Whenever a creature dies, this creature gets +2/+2 until end of turn."
Thraben Sentry // Thraben Militia74%
$0.12↓#28353↓0.0015.1 years↑
"Whenever another creature you control dies, you may transform this creature."
Reaper's Scythe72%
$0.20↑#6895↑0.071.4 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
Jar of Eyeballs72%
$0.23↑#193580.0014.7 years↑
"Whenever a creature you control dies, put two eyeball counters on this artifact."
Rockslide Elemental72%
$0.17↑#24393↓0.18↑18.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Transmogrant's Crown71%
$0.32↑#11277↑0.093.9 years↓
"Equipped creature gets +2/+0."
+1 more matching line
Rot Shambler71%
$0.18↑#13829↑0.30↑11.0 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob71%
$0.04↓#182000.0015.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed71%
$0.09↓#200150.0810.2 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Swarm of Bloodflies70%
$0.08↓#13969↑0.36↑12.1 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
+1 more matching line
Scavenger Drake70%
$0.15↑#225670.0618.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Vengeful Townsfolk70%
$0.13↓#208070.002.5 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."