Scar 
Instant
$0.23 #19614 0.29 18.3 years
Put a -1/-1 counter on target creature.
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Cards similar to Scar 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.
Blight Rot100%
$0.25↑#9217↑0.00↓0.6 years↓
"Put four -1/-1 counters on target creature."
Instill Infection98%
$0.11↓#23712↓0.07↓15.9 years↓
"Put a -1/-1 counter on target creature."
Skinrender96%
$0.17↓#5738↑0.40↑15.9 years↓
"When this creature enters, put three -1/-1 counters on target creature."
Cultbrand Cinder96%
$0.11↓#30299↓0.00↓18.3 years
"When this creature enters, put a -1/-1 counter on target creature."
Grim Affliction95%
$0.31↑#4601↑0.3315.3 years↓
"Put a -1/-1 counter on target creature, then proliferate."
Puncture Bolt92%
$0.20↓#233330.2518.3 years
"this card deals 1 damage to target creature. Put a -1/-1 counter on that creature."
Fume Spitter92%
$0.18↓#10859↑0.05↓15.9 years↓
"Sacrifice this creature: Put a -1/-1 counter on target creature."
Gnarled Effigy92%
$0.18↓#27488↓0.2418.3 years
"
, 
: Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Death Wind90%
$0.07↓#171640.56↑14.3 years↓
"Target creature gets -X/-X until end of turn."
Wring Flesh90%
$0.06↓#27726↓0.00↓15.1 years↓
"Target creature gets -3/-1 until end of turn."
Fatal Fumes90%
$0.02↓#29371↓0.00↓13.3 years↓
"Target creature gets -4/-2 until end of turn."
Tar Snare90%
$0.05↓#29907↓0.00↓10.6 years↓
"Target creature gets -3/-2 until end of turn."
Pull Under90%
$0.12↓#30125↓0.06↓21.9 years↑
"Target creature gets -5/-5 until end of turn."
Demon's Grasp90%
$0.12↓#27189↓0.18↓10.9 years↓
"Target creature gets -5/-5 until end of turn."
Lash of the Whip90%
$0.03↓#28857↓0.57↑12.9 years↓
"Target creature gets -4/-4 until end of turn."
Grasp of Darkness90%
$0.10↓#11433↑0.11↓15.9 years↓
"Target creature gets -4/-4 until end of turn."
Dark Deed90%
$0.21↓#181770.00↓0.2 years↓
"Target creature gets -4/-4 until end of turn."
Throttle90%
$0.06↓#28704↓0.2511.9 years↓
"Target creature gets -4/-4 until end of turn."
Flatten90%
$0.05↓#28309↓0.00↓11.4 years↓
"Target creature gets -4/-4 until end of turn."
Last Gasp90%
$0.04↓#166660.2720.9 years↑
"Target creature gets -3/-3 until end of turn."