Stronghold Discipline 
Sorcery
$0.08 #23224 0.80 26.6 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%
$0.49↑#3669↑0.49↓10.8 years↓
"Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way."
Villainous Wrath88%
$1.00↑#4932↑0.65↓1.0 years↓
"Target opponent loses life equal to the number of creatures they control. Then destroy all creatures."
Incite Rebellion86%
$0.40↑#16766↑0.13↓11.8 years↓
"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%
$0.32↑#15771↑0.25↓20.9 years↓
"When this creature enters, each opponent loses 1 life for each creature they control."
Gruesome Fate80%
$0.24↑#7408↑0.41↓8.6 years↓
"Each opponent loses 1 life for each creature you control."
Scourge of Geier Reach78%
$0.08#248120.07↓14.9 years↓
"This creature gets +1/+1 for each creature your opponents control."
Match the Odds78%
$0.19↑#12015↑0.00↓0.8 years↓
"Create a 1/1 white Ally creature token. Put a +1/+1 counter on it for each creature your opponents control."
Wall Off76%
$0.34↑#245830.00↓0.2 years↓
"This spell costs 
less to cast for each creature your opponents control."
less to cast for each creature your opponents control."
Bond of Agony75%
$1.62↑#15131↑0.07↓20.3 years↓
"Each other player loses X life."
Wing Storm75%
$0.33↑#15373↑0.41↓26.3 years
"this card deals damage to each player equal to twice the number of creatures that player controls with flying."
Primeval Protector72%
$0.80↑#6903↑0.29↓9.8 years↓
"This spell costs less to cast for each creature your opponents control."
less to cast for each creature your opponents control."
Maggot Carrier72%
$0.15↑#225420.24↓25.6 years
"When this creature enters, each player loses 1 life."
Call the Coppercoats71%
$6.78↑#1602↑0.21↓6.4 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%
$0.05↓#249300.24↓17.1 years↓
"When this creature enters, each player loses 3 life."
Rabid Bloodsucker70%
$0.08#272170.21↓11.1 years↓
"When this creature enters, each player loses 2 life."
Blood-Toll Harpy70%
$0.03↓#28363↓0.33↓12.9 years↓
"When this creature enters, each player loses 1 life."
Origin of Black Widow70%
$0.38↑#243750.00↓0.2 years↓
"Each opponent loses 1 life for each creature card in their graveyard."
Riot Control70%
$0.29↑#2308↑0.35↓13.3 years↓
"You gain 1 life for each creature your opponents control. Prevent all damage that would be dealt to you this turn."