Terror Tide 
Sorcery
$0.26 #6795 0.34 2.8 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%
$0.16↓#29423↓0.12↓25.3 years↑
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Chupacabra Echo84%
$0.19↓#13413↓0.21↓2.8 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%
$0.13↓#16987↓0.271.2 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%
$0.34↑#56800.19↓11.1 years↑
"All creatures get -4/-4 until end of turn."
Nausea83%
$0.03↓#17556↓0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel83%
$0.10↓#18243↓0.24↓16.4 years↑
"All creatures get -1/-1 until end of turn."
Infest83%
$0.13↓#21635↓0.05↓23.9 years↑
"All creatures get -2/-2 until end of turn."
Deluge of Doom82%
$0.24↓#10104↓0.13↓1.9 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%
$0.38↑#12213↓0.05↓3.9 years↑
"All creatures get -3/-3 until end of turn."
Toxic Deluge80%
$4.49↑#67↑0.87↑12.8 years↑
"All creatures get -X/-X until end of turn."
Night of Souls' Betrayal80%
$2.02↑#10440↓0.91↑21.9 years↑
"All creatures get -1/-1."
Kaervek, the Spiteful78%
$0.28↑#9999↓0.386.2 years↑
"Other creatures get -1/-1."
Hazardous Conditions78%
$0.05↓#28718↓0.389.9 years↑
"Creatures with no counters on them get -2/-2 until end of turn."
Drag to the Bottom78%
$0.06↓#21276↓0.07↓4.0 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%
$0.13↓#18356↓0.18↓7.9 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."
Mephitic Vapors78%
$0.11↓#20591↓0.367.9 years↑
"All creatures get -1/-1 until end of turn."
Darkness Descends78%
$0.27↑#10402↓0.00↓0.6 years↓
"Put two -1/-1 counters on each creature."
Death's-Head Buzzard78%
$0.09↓#22498↓0.56↑23.3 years↑
"When this creature dies, all creatures get -1/-1 until end of turn."
Havoc Demon78%
$0.14↓#21730↓0.20↓23.6 years↑
"When this creature dies, all creatures get -5/-5 until end of turn."
Hideous Laughter76%
$0.20↓#25202↓0.3021.9 years↑
"All creatures get -2/-2 until end of turn."