Fiendish Duo 
Creature — Devil
$1.70 #3564 0.39 6.8 years
First strike (This creature deals combat damage before creatures without first strike.)
If a source would deal damage to an opponent, it deals double that damage to that player instead.
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Cards similar to Fiendish Duo 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.
Charging Tuskodon95%
$0.13↓#15969↓0.438.6 years↑
"If this creature would deal combat damage to a player, it deals double that damage to that player instead."
Twinflame Tyrant94%
$25.22↑#802↑0.79↑1.8 years↓
"If a source you control would deal damage to an opponent or a permanent an opponent controls, it deals double that damage instead."
Sawhorn Nemesis94%
$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."
Angrath's Marauders92%
$0.33↓#2548↑0.408.9 years↑
"If a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead."
Dictate of the Twin Gods92%
$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."
Goldnight Castigator92%
$0.55↓#12175↓0.4310.4 years↑
"If a source would deal damage to this creature, it deals double that damage to this creature instead."
Fiery Emancipation92%
$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."
Curse of Bloodletting92%
$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."
Bitter Feud91%
$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."
Gratuitous Violence91%
$0.37↓#1512↑0.4623.9 years↑
"If a creature you control would deal damage to a permanent or player, it deals double that damage instead."
Goblin Goliath90%
$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."
, : If a source you control would deal damage to an opponent this turn, it deals double that damage to that player instead."
Lightning, Army of One90%
$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."
Inquisitor's Flail88%
$1.09↓#41410.4214.9 years↑
"If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead."
Furnace of Rath86%
$5.80↑#4576↓0.70↑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 Titania84%
$2.37↑#16312↓0.00↓0.2 years↓
"Double all damage that creature sources you control would deal."
Overblaze82%
$0.40↓#16003↓0.3321.6 years↑
"Each time target permanent would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead."
City on Fire80%
$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."
Bloodletter of Aclazotz80%
$33.26↑#852↑1.09↑2.8 years↓
"If an opponent would lose life during your turn, they lose twice that much life instead."
Wolverine, Best There Is80%
$20.27↑#6852↓1.09↑1.8 years↓
"Double all damage this card would deal."
Neriv, Heart of the Storm80%
$2.10↑#4848↓0.22↓1.4 years↓
"If a creature you control that entered this turn would deal damage, it deals twice that much damage instead."