Stronghold Discipline 
Sorcery
$0.08 #23394 0.41 26.7 years
Each player loses 1 life for each creature they control.
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Cards similar to Stronghold Discipline 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.
Deadly Tempest92%
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"Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way."
Villainous Wrath88%
$0.77↑#4707↑0.321.1 years↓
"Target opponent loses life equal to the number of creatures they control. Then destroy all creatures."
Incite Rebellion86%
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"For each player, this card deals damage to that player and each creature that player controls equal to the number of creatures they control."
Netherborn Phalanx83%
$0.34↑#16019↑0.18↓21.0 years↓
"When this creature enters, each opponent loses 1 life for each creature they control."
Gruesome Fate80%
$0.22↑#7521↑0.338.8 years↓
"Each opponent loses 1 life for each creature you control."
Match the Odds78%
$0.21↑#11989↑0.10↓0.9 years↓
"Create a 1/1 white Ally creature token. Put a +1/+1 counter on it for each creature your opponents control."
Scourge of Geier Reach77%
$0.07↓#251620.16↓15.1 years↓
"This creature gets +1/+1 for each creature your opponents control."
Wall Off76%
$0.29↑#231960.15↓0.3 years↓
"This spell costs 
less to cast for each creature your opponents control."
less to cast for each creature your opponents control."
Wing Storm75%
$0.27↑#15911↑0.09↓26.4 years
"this card deals damage to each player equal to twice the number of creatures that player controls with flying."
Bond of Agony73%
$1.60↑#15250↑0.30↓20.5 years↓
"Each other player loses X life."
Primeval Protector72%
$0.71↑#7040↑0.15↓9.9 years↓
"This spell costs less to cast for each creature your opponents control."
less to cast for each creature your opponents control."
Maggot Carrier72%
$0.17↑#228940.13↓25.7 years
"When this creature enters, each player loses 1 life."
Call the Coppercoats71%
$6.37↑#1650↑0.28↓6.5 years↓
"Choose any number of target opponents. Create X 1/1 white Human Soldier creature tokens, where X is the number of creatures those opponents control."
Howling Banshee70%
$0.07↓#251910.05↓17.3 years↓
"When this creature enters, each player loses 3 life."
Rabid Bloodsucker70%
$0.09↑#276040.00↓11.3 years↓
"When this creature enters, each player loses 2 life."
Blood-Toll Harpy70%
$0.03↓#28747↓0.07↓13.1 years↓
"When this creature enters, each player loses 1 life."
Origin of Black Widow70%
$0.30↑#234330.380.3 years↓
"Each opponent loses 1 life for each creature card in their graveyard."
Riot Control70%
$0.30↑#2260↑0.24↓13.5 years↓
"You gain 1 life for each creature your opponents control. Prevent all damage that would be dealt to you this turn."