Tephraderm 
Creature — Beast
$0.25 #28361 0.12 24.0 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%
$2.22↑#812↑0.58↑6.3 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Mogg Maniac91%
$0.32↑#11828↑0.33↑28.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wall of Souls90%
$1.65↑#16280↑0.1328.6 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Donna Noble88%
$0.37↑#11025↑0.063.0 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Spitemare88%
$0.31↑#12334↑0.1518.2 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Truefire Captain86%
$0.23↓#12831↑0.158.0 years↓
"Whenever this creature is dealt damage, it deals that much damage to target player."
Stuffy Doll86%
$6.00↑#2257↑0.62↑20.0 years↓
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."
+1 more matching line
Guilty Conscience86%
$1.45↑#8102↑0.00↓23.4 years
"Whenever enchanted creature deals damage, this Aura deals that much damage to that creature."
Boros Reckoner86%
$0.24↓#6358↑0.38↑13.7 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Flameblade Angel82%
$0.29↑#20560↑0.25↑10.5 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%
$0.38↑#17511↑0.44↑0.3 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Pain for All82%
$1.05↑#2767↑0.43↑1.2 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Justice82%
$0.22↓#277030.44↑31.4 years↑
"Whenever a red creature or spell deals damage, this enchantment deals that much damage to that creature's or spell's controller."
Blazing Sunsteel82%
$9.52↑#6372↑0.125.9 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Backfire80%
$0.28↑#233010.2132.4 years↑
"Whenever enchanted creature deals damage to you, this Aura deals that much damage to that creature's controller."
Spiteful Sliver78%
$2.25↑#4839↑0.47↑7.4 years↓
"Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker.""
Ill-Tempered Loner // Howlpack Avenger78%
$0.45↑#7218↑0.124.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
+1 more matching line
Needletooth Raptor78%
$0.18↓#11526↑0.078.8 years↓
"Whenever this creature is dealt damage, it deals 5 damage to target creature an opponent controls."
Screaming Nemesis78%
$6.57↑#3722↑1.21↑2.1 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."
Wrathful Red Dragon78%
$9.32↑#2255↑0.48↑4.4 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."