Fiendish Duo 
Creature — Devil
$1.83 #3572 0.46 6.9 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↓#16169↓0.32↓8.8 years↑
"If this creature would deal combat damage to a player, it deals double that damage to that player instead."
Twinflame Tyrant94%
$26.20↑#768↑0.80↑1.9 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%
$0.35↓#6745↓0.63↑2.3 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%
$0.31↓#2609↑0.439.1 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%
$1.34↓#2390↑0.4912.5 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%
$0.52↓#12305↓0.62↑10.5 years↑
"If a source would deal damage to this creature, it deals double that damage to this creature instead."
Fiery Emancipation92%
$8.14↑#864↑0.83↑6.3 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%
$2.19↑#7754↓0.5014.7 years↑
"If a source would deal damage to enchanted player, it deals double that damage to that player instead."
Bitter Feud91%
$0.56↓#15454↓0.14↓12.0 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%
$0.64↓#1511↑0.4324.0 years↑
"If a creature you control would deal damage to a permanent or player, it deals double that damage instead."
Goblin Goliath90%
$0.28↓#14082↓0.61↑7.9 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%
$8.48↑#2364↑0.90↑1.4 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%
$1.06↓#41230.19↓15.1 years↑
"If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead."
Furnace of Rath86%
$6.21↑#4645↓0.60↑29.0 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%
$1.94↑#15012↓0.550.3 years↓
"Double all damage that creature sources you control would deal."
Overblaze82%
$0.33↓#16166↓0.16↓21.7 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 Fire81%
$10.35↑#903↑0.81↑3.5 years↓
"If a source you control would deal damage to a permanent or player, it deals triple that damage instead."
Bloodletter of Aclazotz80%
$34.53↑#863↑1.23↑2.9 years↓
"If an opponent would lose life during your turn, they lose twice that much life instead."
Wolverine, Best There Is80%
$15.55↑#6722↓0.74↑2.0 years↓
"Double all damage this card would deal."
Solphim, Mayhem Dominus78%
$28.83↑#901↑0.76↑3.7 years↓
"If a source you control would deal noncombat damage to an opponent or a permanent an opponent controls, it deals double that damage to that player or permanent instead."