Wrathful Red Dragon 
Creature — Dragon
$6.44 #2260 0.44 4.2 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%
$0.33↓#12410↓0.73↑18.1 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Boros Reckoner90%
$0.28↓#6342↓0.17↓13.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Wrathful Raptors88%
$5.11↓#26290.32↓2.8 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%
$0.37↓#18833↓0.00↓0.2 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Blazing Sunsteel87%
$15.51↑#6474↓0.57↑5.8 years↑
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Scourge of Valkas84%
$3.43↓#1527↑0.4513.1 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."
+1 more matching line
Flameblade Angel84%
$0.30↓#20212↓0.30↓10.4 years↑
"Flying"
Dragon Tempest82%
$2.54↓#848↑0.5311.4 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%
$0.41↓#7185↓0.25↓4.8 years
"Whenever this creature is dealt damage, it deals that much damage to any target."
Invasion of Tarkir // Defiant Thundermaw81%
$2.41↓#8084↓0.443.4 years
"Whenever a Dragon you control attacks, it deals 2 damage to any target."
Utvara Hellkite80%
$12.02↑#1530↑0.5013.9 years↑
"Flying"
Mogg Maniac80%
$0.35↓#11772↓0.4428.5 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Lozhan, Dragons' Legacy79%
$0.29↓#4244↓0.18↓4.2 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%
$6.29↓#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."
Scaldkin79%
$0.03↓#31397↓0.00↓11.9 years↑
"Flying"
Brash Taunter78%
$1.61↓#790↑0.496.2 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Tephraderm78%
$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."
Wall of Souls78%
$2.06↓#16164↓0.29↓28.5 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Jennifer Walters // The Sensational She-Hulk76%
$9.32↑#8426↓0.00↓0.2 years↓
"Whenever a creature you control is dealt damage, you may have The Sensational She-Hulk deal that much damage to any target. Do this only once each turn."
Sarkhan's Rage76%
$0.06↓#24862↓0.06↓11.4 years↑
"this card deals 5 damage to any target. If you control no Dragons, this card deals 2 damage to you."