Toxic Stench 
Instant
$0.19 #28358 0.08 24.4 years
Target nonblack creature gets -1/-1 until end of turn.
Threshold — If there are seven or more cards in your graveyard, instead destroy that creature. It can't be regenerated.
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Cards similar to Toxic Stench 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.
Kirtar's Wrath86%
$0.22↑#13826↑0.42↑25.1 years
"If there are seven or more cards in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated."
Join the Dead83%
$0.17↓#13008↑0.062.9 years↓
"Target creature gets -5/-5 until end of turn."
+1 more matching line
Tomb Hex80%
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"Target creature gets -2/-2 until end of turn."
Death Wind80%
$0.07↓#17443↑0.0714.5 years↓
"Target creature gets -X/-X until end of turn."
Stab80%
$0.20↑#10974↑0.151.9 years↓
"Target creature gets -2/-2 until end of turn."
Disfigure80%
$0.05↓#16432↑0.1417.0 years↓
"Target creature gets -2/-2 until end of turn."
Fatal Fumes80%
$0.07↓#288490.1213.5 years↓
"Target creature gets -4/-2 until end of turn."
Tar Snare80%
$0.03↓#297510.0010.7 years↓
"Target creature gets -3/-2 until end of turn."
Last Gasp80%
$0.05↓#15840↑0.0021.0 years↓
"Target creature gets -3/-3 until end of turn."
Strangling Spores80%
$0.10↓#294890.008.3 years↓
"Target creature gets -3/-3 until end of turn."
Smother80%
$0.20↑#238720.1224.0 years
"Destroy target creature with mana value 3 or less. It can't be regenerated."
Scorpion's Sting79%
$0.18↓#14039↑0.27↑1.1 years↓
"Target creature gets -3/-3 until end of turn."
Tragic Fall79%
$0.05↓#21424↑0.125.3 years↓
"Target creature gets -3/-3 until end of turn."
Tragic Slip78%
$0.18↓#885↑0.23↑14.7 years↓
"Target creature gets -1/-1 until end of turn."
+1 more matching line
Cabal Torturer78%
$0.08↓#278390.1124.7 years
", 
: Target creature gets -1/-1 until end of turn."
, : Target creature gets -1/-1 until end of turn."+1 more matching line
Pull Under77%
$0.09↓#304290.1222.1 years↓
"Target creature gets -5/-5 until end of turn."
Demon's Grasp77%
$0.13↓#274280.0011.0 years↓
"Target creature gets -5/-5 until end of turn."
Throttle77%
$0.05↓#289820.32↑12.1 years↓
"Target creature gets -4/-4 until end of turn."
Dark Deed77%
$0.21↑#16828↑0.130.3 years↓
"Target creature gets -4/-4 until end of turn."
Grasp of Darkness77%
$0.09↓#11722↑0.24↑16.1 years↓
"Target creature gets -4/-4 until end of turn."