Raphael, the Muscle 
Legendary Creature — Mutant Ninja Turtle
$0.69 #7665 0.00 0.5 years
Double all damage that creatures you control with counters on them would deal.
When Raphael enters, create a Mutagen token.
Partner—Character select (You can have two commanders if both have this ability.)
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Cards similar to Raphael, the Muscle 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.
Absorbing Man and Titania84%
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"Double all damage that creature sources you control would deal."
Gratuitous Violence83%
$0.37↓#1512↑0.46↑23.9 years↑
"If a creature you control would deal damage to a permanent or player, it deals double that damage instead."
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$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."
Angrath's Marauders82%
$0.33↓#2548↑0.40↑8.9 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."
Charging Tuskodon81%
$0.13↓#15969↓0.43↑8.6 years↑
"If this creature would deal combat damage to a player, it deals double that damage to that player instead."
Fiery Emancipation81%
$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."
Slithering Cryptid80%
$0.10↓#24675↓0.000.5 years
"When this creature enters, create a Mutagen token."
Crustacean Commando80%
$0.15↓#20121↓0.000.5 years
"When this creature enters, create a Mutagen token."
Wolverine, Best There Is80%
$20.27↑#68521.09↑1.8 years↑
"Double all damage this card would deal."
Goldnight Castigator80%
$0.55↓#12175↓0.43↑10.4 years↑
"If a source would deal damage to you, it deals double that damage to you instead."
Sawhorn Nemesis80%
$0.39↓#65270.43↑2.2 years↑
"If a source would deal damage to the chosen player or a permanent they control, it deals double that damage instead."
Michelangelo, the Heart79%
$1.19↑#85210.000.5 years
"Partner—Character select"
Splinter, the Mentor78%
$0.89↑#87110.000.5 years
"Partner—Character select"
Fiendish Duo78%
$1.70↑#3564↑0.39↑6.8 years↑
"If a source would deal damage to an opponent, it deals double that damage to that player instead."
Curse of Bloodletting77%
$1.63↑#77260.24↑14.6 years↑
"If a source would deal damage to enchanted player, it deals double that damage to that player instead."
Dictate of the Twin Gods76%
$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."
Inquisitor's Flail76%
$1.09↑#4141↑0.42↑14.9 years↑
"If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead."
Uncivil Unrest76%
$18.08↑#2947↑0.32↑3.4 years↑
"If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead."
Donatello, the Brains75%
$0.62↓#72230.000.5 years
"Partner—Character select"
+1 more matching line
Lightning, Army of One74%
$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."