Inquisitor's Flail 
Artifact — Equipment
$1.09 #4141 0.42 14.9 years
If equipped creature would deal combat damage, it deals double that damage instead.
If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead.
Equip 
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Cards similar to Inquisitor's Flail 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.
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"If a source would deal damage to this creature, it deals double that damage to this creature instead."
+1 more matching line
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"If a creature you control would deal damage to a permanent or player, it deals double that damage instead."
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"If a source you control would deal damage to an opponent or a permanent an opponent controls, it deals double that damage instead."
Curse of Bloodletting88%
$1.63↑#7726↓0.24↓14.6 years
"If a source would deal damage to enchanted player, it deals double that damage to that player instead."
Angrath's Marauders88%
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"If a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."
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Fiery Emancipation87%
$7.79↑#855↑0.79↑6.2 years↓
"If a source you control would deal damage to a permanent or player, it deals triple that damage to that permanent or player instead."
Sawhorn Nemesis86%
$0.39↓#6527↓0.432.2 years↓
"If a source would deal damage to the chosen player or a permanent they control, it deals double that damage instead."
Dictate of the Twin Gods86%
$1.24↑#2350↑0.59↑12.4 years↓
"If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."
Lightning, Army of One84%
$10.59↑#2473↑0.79↑1.2 years↓
"Whenever this card deals combat damage to a player, until your next turn, if a source would deal damage to that player or a permanent that player controls, it deals double that damage instead."
Neriv, Heart of the Storm82%
$2.10↑#48480.22↓1.4 years↓
"If a creature you control that entered this turn would deal damage, it deals twice that much damage instead."
Goblin Goliath82%
$0.29↓#14003↓0.53↑7.8 years↓
"
,
: If a source you control would deal damage to an opponent this turn, it deals double that damage to that player instead."
Furnace of Rath81%
$5.80↑#45760.70↑28.9 years↑
"If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."
Absorbing Man and Titania80%
$2.37↑#16312↓0.00↓0.2 years↓
"Double all damage that creature sources you control would deal."
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"If enchanted creature would deal combat damage to a permanent or player, it deals double that damage instead."
Bitter Feud78%
$0.50↓#15135↓0.13↓11.8 years↓
"If a source controlled by one of the chosen players would deal damage to the other chosen player or a permanent that player controls, that source deals double that damage to that player or permanent instead."
City on Fire77%
$11.43↑#869↑0.66↑3.4 years↓
"If a source you control would deal damage to a permanent or player, it deals triple that damage instead."