Gideon's Intervention 
Enchantment
$0.27 #20742 0.56 9.4 years
As this enchantment enters, choose a card name.
Your opponents can't cast spells with the chosen name.
Prevent all damage that would be dealt to you and permanents you control by sources with the chosen name.
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Cards similar to Gideon's Intervention 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.
Council of the Absolute90%
$0.36↑#241330.6313.3 years↑
"Your opponents can't cast spells with the chosen name."
+1 more matching line
Endure88%
$0.18↓#27090↓0.33↓18.1 years↑
"Prevent all damage that would be dealt to you and permanents you control this turn."
Alhammarret, High Arbiter88%
$0.23↓#197410.5711.1 years↑
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Nevermore86%
$1.02↑#14808↑0.84↑14.9 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Null Chamber84%
$1.44↑#25784↓0.88↑29.9 years↑
"As this enchantment enters, you and an opponent each choose a card name other than a basic land card name."
+1 more matching line
Runed Halo80%
$0.15↓#188830.29↓18.3 years↑
"As this enchantment enters, choose a card name."
+1 more matching line
The Wanderer80%
$0.32↑#4993↑0.35↓7.3 years↓
"Prevent all noncombat damage that would be dealt to you and other permanents you control."
Harm's Way80%
$0.08↓#28209↓0.27↓17.1 years↑
"The next 2 damage that a source of your choice would deal to you and/or permanents you control this turn is dealt to any target instead."
Voidstone Gargoyle78%
$0.28↑#27537↓0.68↑19.6 years↑
"Spells with the chosen name can't be cast."
+2 more matching lines
Rem Karolus, Stalwart Slayer78%
$0.36↑#7919↑0.22↓4.9 years↓
"If a spell would deal damage to you or another permanent you control, prevent that damage."
Light of Sanction78%
$0.42↑#233930.4720.9 years↑
"Prevent all damage that would be dealt to creatures you control by sources you control."
Palisade Giant78%
$0.27#16404↑0.40↓13.9 years↑
"All damage that would be dealt to you and other permanents you control is dealt to this creature instead."
Meddling Mage77%
$1.70↑#177830.88↑25.6 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Divine Deflection77%
$0.26↓#199380.06↓14.3 years↑
"Prevent the next X damage that would be dealt to you and/or permanents you control this turn. If damage is prevented this way, this card deals that much damage to any target."
Academic Probation76%
$0.17↓#246650.71↑5.4 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
Safe Passage76%
$0.11↓#10820↑0.6017.1 years↑
"Prevent all damage that would be dealt to you and creatures you control this turn."
Bubble Matrix76%
$11.59↑#189360.89↑29.2 years↑
"Prevent all damage that would be dealt to creatures."
Conjurer's Ban76%
$0.21↓#28526↓0.22↓20.6 years↑
"Choose a card name. Until your next turn, spells with the chosen name can't be cast and lands with the chosen name can't be played."
Failure // Comply75%
$0.31↑#216840.35↓9.4 years
"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."
Mark of Asylum75%
$1.82↑#166260.06↓17.6 years↑
"Prevent all noncombat damage that would be dealt to creatures you control."