Wrathful Red Dragon 
Creature — Dragon
$9.32 #2255 0.48 4.4 years
Flying
Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon.
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Cards similar to Wrathful Red Dragon 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.
Spitemare92%
$0.31↓#12334↓0.15↓18.2 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Boros Reckoner90%
$0.24↓#6358↓0.3813.7 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Wrathful Raptors88%
$7.22↓#26460.452.9 years↓
"Whenever a Dinosaur you control is dealt damage, it deals that much damage to any target that isn't a Dinosaur."
Black Panther, Most Dangerous87%
$0.38↓#17511↓0.440.3 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Blazing Sunsteel87%
$9.52↑#6372↓0.12↓5.9 years↑
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Scourge of Valkas84%
$1.25↓#1506↑0.59↑13.3 years↑
"Whenever this creature or another Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Bogardan Hellkite83%
$0.38↓#8629↓0.06↓20.0 years↑
"Flying"
Dragon Tempest82%
$1.46↓#842↑0.62↑11.6 years↑
"Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control."
Ill-Tempered Loner // Howlpack Avenger82%
$0.45↓#7218↓0.12↓4.9 years
"Whenever this creature is dealt damage, it deals that much damage to any target."
Invasion of Tarkir // Defiant Thundermaw81%
$2.89↓#8210↓0.06↓3.5 years
"Whenever a Dragon you control attacks, it deals 2 damage to any target."
Spawn of Thraxes80%
$0.32↓#11266↓0.00↓12.5 years↑
"Flying"
Jennifer Walters // The Sensational She-Hulk80%
$5.36↓#7159↓0.66↑0.3 years↓
"Whenever a creature you control is dealt damage, you may have this card deal that much damage to any target. Do this only once each turn."
Mogg Maniac80%
$0.32↓#11828↓0.33↓28.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Lozhan, Dragons' Legacy79%
$0.25↓#4373↓0.16↓4.4 years
"Whenever you cast an Adventure or Dragon spell, this card deals damage equal to that spell's mana value to any target that isn't a commander."
Screaming Nemesis79%
$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."
Be'lakor, the Dark Master79%
$3.61↓#7650↓0.12↓4.0 years
"Flying"
Brash Taunter78%
$2.22↓#812↑0.586.3 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Phyrexian Vindicator78%
$6.19↓#3168↓0.523.7 years
"If damage would be dealt to this creature, prevent that damage. When damage is prevented this way, this creature deals that much damage to any other target."
+1 more matching line
Forgestoker Dragon78%
$0.27↓#21888↓0.07↓12.7 years↑
"Flying"
Tephraderm78%
$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."