Tephraderm 
Creature — Beast
$0.24 #27989 0.31 23.9 years
Whenever a creature deals damage to this creature, this creature deals that much damage to that creature.
Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller.
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Cards similar to Tephraderm 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.
Brash Taunter92%
$1.61↑#790↑0.49↑6.2 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Mogg Maniac90%
$0.35↑#11772↑0.44↑28.5 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wall of Souls90%
$2.06↑#16164↑0.2928.5 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Donna Noble88%
$0.42↑#10942↑0.50↑2.9 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Spitemare88%
$0.33↑#12410↑0.73↑18.1 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Stuffy Doll86%
$5.73↑#2248↑0.69↑19.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."
+1 more matching line
Truefire Captain86%
$0.24#12709↑0.20↓7.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to target player."
Guilty Conscience86%
$1.67↑#8238↑0.70↑23.3 years
"Whenever enchanted creature deals damage, this Aura deals that much damage to that creature."
Boros Reckoner86%
$0.28↑#6342↑0.17↓13.6 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Justice85%
$0.21↓#275180.12↓31.3 years↑
"Whenever a red creature or spell deals damage, this enchantment deals that much damage to that creature's or spell's controller."
Flameblade Angel82%
$0.30↑#20212↑0.3010.4 years↓
"Whenever a source an opponent controls deals damage to you or a permanent you control, you may have this creature deal 1 damage to that source's controller."
Black Panther, Most Dangerous82%
$0.37↑#18833↑0.00↓0.2 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Pain for All82%
$0.75↑#2976↑0.42↑1.1 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Blazing Sunsteel82%
$15.51↑#6474↑0.57↑5.8 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Backfire80%
$0.27↑#230780.2432.3 years↑
"Whenever enchanted creature deals damage to you, this Aura deals that much damage to that creature's controller."
Ill-Tempered Loner // Howlpack Avenger78%
$0.41↑#7185↑0.254.8 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
+1 more matching line
Mangara's Equity78%
$0.17↓#306270.61↑29.9 years↑
"Whenever a creature of the chosen color deals damage to you or a white creature you control, this enchantment deals that much damage to that creature."
Spiteful Sliver78%
$2.07↑#4756↑0.64↑7.2 years↓
"Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker.""
Needletooth Raptor78%
$0.19↓#11451↑0.16↓8.6 years↓
"Whenever this creature is dealt damage, it deals 5 damage to target creature an opponent controls."
Screaming Nemesis78%
$6.29↑#3741↑0.90↑1.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to any other target. If a player is dealt damage this way, they can't gain life for the rest of the game."