Flowstone Slide 
Sorcery
$0.17 #28131 0.20 26.7 years
All creatures get +X/-X until end of turn.
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Cards similar to Flowstone Slide 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.
Rollick of Abandon99%
$0.03↓#300020.2712.5 years↓
"All creatures get +2/-2 until end of turn."
Languish94%
$0.35↑#5753↑0.2611.3 years↓
"All creatures get -4/-4 until end of turn."
Infest94%
$0.10↓#21931↑0.07↓24.0 years↓
"All creatures get -2/-2 until end of turn."
Nausea94%
$0.03↓#18163↑0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel94%
$0.10↓#18854↑0.07↓16.5 years↓
"All creatures get -1/-1 until end of turn."
Night of Souls' Betrayal90%
$2.01↑#10844↑0.60↑22.1 years↓
"All creatures get -1/-1."
Kaervek, the Spiteful90%
$0.29↑#10369↑0.58↑6.3 years↓
"Other creatures get -1/-1."
Flowstone Surge90%
$0.24↑#291490.06↓26.7 years
"Creatures you control get +1/-1."
Drag to the Bottom89%
$0.12↓#21670↑0.224.1 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."
Final Revels88%
$0.15↓#314870.1119.0 years↓
"• All creatures get -0/-2 until end of turn."
Toxic Deluge88%
$5.07↑#66↑0.81↑13.0 years↓
"All creatures get -X/-X until end of turn."
Blight Grenade86%
$0.39↑#12533↑0.32↑4.0 years↓
"All creatures get -3/-3 until end of turn."
Hideous Laughter86%
$0.19↑#254700.31↑22.1 years↓
"All creatures get -2/-2 until end of turn."
Planar Despair85%
$0.18↑#298710.2225.4 years↓
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Sulfur Elemental82%
$0.17#304990.05↓19.7 years↓
"White creatures get +1/-1."
Withering Curse82%
$0.99↑#9784↑0.50↑0.5 years↓
"All creatures get -2/-2 until end of turn."
Mephitic Vapors82%
$0.11↓#21206↑0.00↓8.0 years↓
"All creatures get -1/-1 until end of turn."
Darkness Descends80%
$0.26↑#10057↑0.37↑0.7 years↓
"Put two -1/-1 counters on each creature."
Biting Rain80%
$0.13↓#15789↑0.2410.5 years↓
"All creatures get -2/-2 until end of turn."
Hazardous Conditions80%
$0.06↓#289960.40↑10.1 years↓
"Creatures with no counters on them get -2/-2 until end of turn."