Terror Tide 
Sorcery
$0.28 #7104 0.17 2.9 years
Fathomless descent — All creatures get -X/-X until end of turn, where X is the number of permanent cards in your graveyard.
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Cards similar to Terror Tide 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.
Planar Despair84%
$0.18↓#29871↓0.2225.4 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Chupacabra Echo84%
$0.22↓#13743↓0.192.9 years
"When this creature enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Cloud of Darkness84%
$0.14↓#17086↓0.251.4 years↓
"When this card enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Languish83%
$0.35↑#57530.2611.3 years↑
"All creatures get -4/-4 until end of turn."
Nausea83%
$0.03↓#18163↓0.06↓28.3 years↑
"All creatures get -1/-1 until end of turn."
Shrivel83%
$0.10↓#18854↓0.07↓16.5 years↑
"All creatures get -1/-1 until end of turn."
Infest83%
$0.10↓#21931↓0.07↓24.0 years↑
"All creatures get -2/-2 until end of turn."
Deluge of Doom82%
$0.24↓#10687↓0.132.1 years
"All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard."
Blight Grenade82%
$0.39↑#12533↓0.32↑4.0 years↑
"All creatures get -3/-3 until end of turn."
Night of Souls' Betrayal80%
$2.01↑#10844↓0.60↑22.1 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful78%
$0.29↑#10369↓0.58↑6.3 years↑
"Other creatures get -1/-1."
Hazardous Conditions78%
$0.06↓#28996↓0.40↑10.1 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Mephitic Vapors78%
$0.11↓#21206↓0.00↓8.0 years↑
"All creatures get -1/-1 until end of turn."
Death's-Head Buzzard78%
$0.08↓#23138↓0.1023.4 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Havoc Demon78%
$0.14↓#22009↓0.1623.7 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Drag to the Bottom78%
$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."
Necrotic Wound78%
$0.14↓#18631↓0.128.0 years↑
"Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die this turn, exile it instead."
Toxic Deluge78%
$5.07↑#66↑0.81↑13.0 years↑
"All creatures get -X/-X until end of turn."
Hideous Laughter76%
$0.19↓#25470↓0.31↑22.1 years↑
"All creatures get -2/-2 until end of turn."
Rollick of Abandon76%
$0.03↓#30002↓0.27↑12.5 years↑
"All creatures get +2/-2 until end of turn."