Mogg Maniac 
Creature — Goblin
$0.32 #11828 0.33 28.6 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%
$1.65↑#16280↓0.13↓28.6 years
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Brash Taunter93%
$2.22↑#812↑0.58↑6.3 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Frilled Deathspitter91%
$0.16↓#14744↓0.13↓8.8 years↓
"Whenever this creature is dealt damage, it deals 2 damage to target opponent or planeswalker."
Tephraderm91%
$0.25↓#28361↓0.12↓24.0 years↓
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Donna Noble90%
$0.37↑#110250.06↓3.0 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Sun-Crowned Hunters90%
$0.18↓#15253↓0.05↓9.1 years↓
"Whenever this creature is dealt damage, it deals 3 damage to target opponent or planeswalker."
Spitemare90%
$0.31↓#123340.15↓18.2 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Fiendlash89%
$0.38↑#4958↑0.10↓5.2 years↓
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
Truefire Captain88%
$0.23↓#128310.15↓8.0 years↓
"Whenever this creature is dealt damage, it deals that much damage to target player."
Spiteful Sliver88%
$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.""
Boros Reckoner88%
$0.24↓#6358↑0.3813.7 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Black Panther, Most Dangerous85%
$0.38↑#17511↓0.44↑0.3 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Blazing Sunsteel84%
$9.52↑#6372↑0.12↓5.9 years↓
"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Stuffy Doll84%
$6.00↑#2257↑0.62↑20.0 years↓
"Whenever this creature is dealt damage, it deals that much damage to the chosen player."
Kyren Sniper83%
$0.18↓#25793↓0.20↓27.0 years↓
"At the beginning of your upkeep, you may have this creature deal 1 damage to target player or planeswalker."
Pain for All83%
$1.05↑#2767↑0.431.2 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Screaming Nemesis81%
$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."
Ill-Tempered Loner // Howlpack Avenger80%
$0.45↑#7218↑0.12↓4.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
Chandra's Magmutt80%
$0.10↓#14955↓0.13↓6.3 years↓
"
: This creature deals 1 damage to target player or planeswalker."
: This creature deals 1 damage to target player or planeswalker."
Goblin Fireslinger80%
$0.21↓#128510.16↓15.3 years↓
": This creature deals 1 damage to target player or planeswalker."
: This creature deals 1 damage to target player or planeswalker."