Withering Curse 
Sorcery
$0.99 #9784 0.50 0.5 years
All creatures get -2/-2 until end of turn.
Infusion — If you gained life this turn, destroy all creatures instead.
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Cards similar to Withering Curse 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.
Infest90%
$0.10↓#21931↓0.07↓24.0 years↑
"All creatures get -2/-2 until end of turn."
Nausea90%
$0.03↓#18163↓0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel90%
$0.10↓#18854↓0.07↓16.5 years↑
"All creatures get -1/-1 until end of turn."
Languish90%
$0.35↓#5753↑0.26↓11.3 years↑
"All creatures get -4/-4 until end of turn."
Blight Grenade87%
$0.39↓#12533↓0.32↓4.0 years↑
"All creatures get -3/-3 until end of turn."
+1 more matching line
Night of Souls' Betrayal87%
$2.01↑#108440.6022.1 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful86%
$0.29↓#103690.586.3 years↑
"Other creatures get -1/-1."
Toxic Deluge85%
$5.07↑#66↑0.81↑13.0 years↑
"All creatures get -X/-X until end of turn."
Drag to the Bottom84%
$0.12↓#21670↓0.22↓4.1 years↑
"Each creature gets -X/-X until end of turn, where X is 1 plus the number of basic land types among lands you control."
Hideous Laughter83%
$0.19↓#25470↓0.31↓22.1 years↑
"All creatures get -2/-2 until end of turn."
Darkness Descends82%
$0.26↓#100570.37↓0.7 years
"Put two -1/-1 counters on each creature."
Flowstone Slide82%
$0.17↓#28131↓0.20↓26.7 years↑
"All creatures get +X/-X until end of turn."
Final Revels82%
$0.15↓#31487↓0.11↓19.0 years↑
"• All creatures get -0/-2 until end of turn."
Golden Demise81%
$0.22↓#18504↓0.19↓8.8 years↑
"All creatures get -2/-2 until end of turn. If you have the city's blessing, instead only creatures your opponents control get -2/-2 until end of turn."
Planar Despair80%
$0.18↓#29871↓0.22↓25.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Mephitic Vapors80%
$0.11↓#21206↓0.00↓8.0 years↑
"All creatures get -1/-1 until end of turn."
Biting Rain79%
$0.13↓#15789↓0.24↓10.5 years↑
"All creatures get -2/-2 until end of turn."
Rollick of Abandon78%
$0.03↓#30002↓0.27↓12.5 years↑
"All creatures get +2/-2 until end of turn."
Hazardous Conditions78%
$0.06↓#28996↓0.4010.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Golgari Charm78%
$0.82↓#1622↑0.21↓14.0 years↑
"• All creatures get -1/-1 until end of turn."