Soulstinger 
Creature — Scorpion Demon
$0.18 #20032 0.18 9.5 years
When this creature enters, put two -1/-1 counters on target creature you control.
When this creature dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on this creature.
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Cards similar to Soulstinger 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.
Ornery Kudu94%
$0.11↓#29999↓0.00↓9.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Crocodile of the Crossing94%
$0.08↓#26332↓0.00↓9.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Grief Tyrant94%
$0.15↓#26356↓0.06↓18.5 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
Defiant Greatmaw92%
$0.17↓#220380.00↓9.5 years
"When this creature enters, put two -1/-1 counters on target creature you control."
+1 more matching line
Baleful Ammit92%
$0.24↑#201370.129.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Lockjaw Snapper91%
$1.54↑#161400.1818.5 years↑
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
Banewhip Punisher90%
$0.25↑#11192↑0.06↓9.3 years
"When this creature enters, you may put a -1/-1 counter on target creature."
+1 more matching line
Decimator Beetle89%
$0.08↓#187330.119.5 years
"When this creature enters, put a -1/-1 counter on target creature you control."
Festering Mummy88%
$0.19↑#12801↑0.00↓9.5 years
"When this creature dies, you may put a -1/-1 counter on target creature."
Plague Belcher86%
$0.37↑#3625↑0.129.5 years
"When this creature enters, put two -1/-1 counters on target creature you control."
Exemplar of Strength85%
$0.19↑#24759↓0.00↓9.5 years
"When this creature enters, put three -1/-1 counters on target creature you control."
Channeler Initiate85%
$0.15↓#5784↑0.06↓9.5 years
"When this creature enters, put three -1/-1 counters on target creature you control."
Splatter Goblin85%
$0.12↓#26235↓0.35↑4.1 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Shambling Goblin85%
$0.08↓#218480.06↓11.6 years↑
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Front Porch Sentries85%
$0.07↓#228300.04↓0.2 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Grim Physician85%
$0.18#224290.116.7 years↓
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Disease Carriers85%
$0.13↓#25986↓0.07↓27.4 years↑
"When this creature dies, target creature gets -2/-2 until end of turn."
Hornet Harasser85%
$0.18#29711↓0.00↓19.0 years↑
"When this creature dies, target creature gets -2/-2 until end of turn."
Lethal Sting85%
$0.21↑#189370.259.3 years
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."
Undead Executioner84%
$0.04↓#30004↓0.00↓14.5 years↑
"When this creature dies, you may have target creature get -2/-2 until end of turn."