Mogg Maniac 
Creature — Goblin
$0.35 #11772 0.44 28.5 years
Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker.
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Cards similar to Mogg Maniac 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.
Wall of Souls99%
$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."
Brash Taunter93%
$1.61↑#790↑0.496.2 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Donna Noble90%
$0.42↑#109420.502.9 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Tephraderm90%
$0.24↓#27989↓0.31↓23.9 years↓
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Frilled Deathspitter90%
$0.16↓#14568↓0.29↓8.6 years↓
"Whenever this creature is dealt damage, it deals 2 damage to target opponent or planeswalker."
Spitemare90%
$0.33↓#124100.73↑18.1 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Fiendlash89%
$0.39↑#4978↑0.33↓5.1 years↓
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
Sun-Crowned Hunters88%
$0.21↓#15040↓0.14↓8.9 years↓
"Whenever this creature is dealt damage, it deals 3 damage to target opponent or planeswalker."
Truefire Captain88%
$0.24↓#127090.20↓7.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to target player."
Spiteful Sliver88%
$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.""
Boros Reckoner88%
$0.28↓#6342↑0.17↓13.6 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Stuffy Doll85%
$5.73↑#2248↑0.69↑19.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."
Blazing Sunsteel84%
$15.51↑#6474↑0.57↑5.8 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Black Panther, Most Dangerous84%
$0.37↑#18833↓0.00↓0.2 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Kyren Sniper82%
$0.19↓#25478↓0.3626.9 years↓
"At the beginning of your upkeep, you may have this creature deal 1 damage to target player or planeswalker."
Pain for All82%
$0.75↑#2976↑0.421.1 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Screaming Nemesis80%
$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."
Justice80%
$0.21↓#27518↓0.12↓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."
Ill-Tempered Loner // Howlpack Avenger80%
$0.41↑#7185↑0.25↓4.8 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Wrathful Red Dragon80%
$6.44↑#2260↑0.444.2 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."