Lockjaw Snapper 
Artifact Creature — Scarecrow
$1.11 #15839 0.29 18.3 years
Wither (This deals damage to creatures in the form of -1/-1 counters.)
When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it.
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Cards similar to Lockjaw Snapper 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.
Grief Tyrant92%
$0.16↓#25986↓0.42↑18.3 years
"When this creature dies, put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
+1 more matching line
Soulstinger91%
$0.12↓#19695↓0.00↓9.4 years↓
"When this creature dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
+1 more matching line
Festering Mummy90%
$0.29↓#12529↑0.249.4 years↓
"When this creature dies, you may put a -1/-1 counter on target creature."
Death's-Head Buzzard88%
$0.09↓#22498↓0.56↑23.3 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Havoc Demon88%
$0.14↓#21730↓0.2023.6 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Darkness Descends88%
$0.27↓#10402↑0.00↓0.6 years↓
"Put two -1/-1 counters on each creature."
Harbinger of Night86%
$28.20↑#142220.50↑29.9 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Bile-Vial Boggart86%
$0.23↓#134230.00↓0.6 years↓
"When this creature dies, put a -1/-1 counter on up to one target creature."
Soul Snuffers86%
$0.27↓#5038↑0.2118.1 years
"When this creature enters, put a -1/-1 counter on each creature."
Plague Dogs84%
$0.19↓#29739↓0.07↓27.2 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Necropede84%
$0.39↓#9403↑0.08↓15.9 years↓
"When this creature dies, you may put a -1/-1 counter on target creature."
+1 more matching line
Blowfly Infestation84%
$0.37↓#3092↑0.2918.3 years
"Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature."
Front Porch Sentries80%
$0.06↓#24907↓0.00↓0.1 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Splatter Goblin80%
$0.13↓#25851↓0.63↑4.0 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Grim Physician80%
$0.25↓#22078↓0.18↓6.6 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Shambling Goblin80%
$0.08↓#21489↓0.00↓11.4 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Undead Executioner80%
$0.05↓#29676↓0.00↓14.3 years↓
"When this creature dies, you may have target creature get -2/-2 until end of turn."
Disease Carriers80%
$0.12↓#25770↓0.3027.2 years↑
"When this creature dies, target creature gets -2/-2 until end of turn."
Hornet Harasser80%
$0.12↓#29375↓0.00↓18.9 years
"When this creature dies, target creature gets -2/-2 until end of turn."
Dusk Urchins79%
$0.21↓#6538↑0.3318.3 years
"When this creature dies, draw a card for each -1/-1 counter on it."
+1 more matching line