Boros Reckoner 
Creature — Minotaur Wizard
$0.24 #6358 0.38 13.7 years
Whenever this creature is dealt damage, it deals that much damage to any target.
: This creature gains first strike until end of turn.Click a line or tag to filter
Cards similar to Boros Reckoner 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.
Spitemare98%
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"Whenever this creature is dealt damage, it deals that much damage to any target."
Black Panther, Most Dangerous94%
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"Whenever this card is dealt damage, he deals that much damage to any other target."
Blazing Sunsteel93%
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"Whenever equipped creature is dealt damage, it deals that much damage to any target."
Ill-Tempered Loner // Howlpack Avenger90%
$0.45↑#72180.12↓4.9 years↓
"Whenever this creature is dealt damage, it deals that much damage to any target."
+1 more matching line
Wrathful Red Dragon90%
$9.32↑#2255↑0.484.4 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Mogg Maniac88%
$0.32↑#11828↓0.3328.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Brash Taunter87%
$2.22↑#812↑0.58↑6.3 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Screaming Nemesis86%
$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 Raptors86%
$7.22↑#2646↑0.452.9 years↓
"Whenever a Dinosaur you control is dealt damage, it deals that much damage to any target that isn't a Dinosaur."
Tephraderm86%
$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."
Jennifer Walters // The Sensational She-Hulk86%
$5.36↑#71590.66↑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."
Wall of Souls86%
$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."
Titanium Golem85%
$0.04↓#32014↓0.11↓23.0 years↑
"
: This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."
Saberclaw Golem84%
$0.08↓#31488↓0.05↓16.1 years↑
"
: This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."
War-Spike Changeling84%
$0.20↓#19808↓0.00↓18.7 years↑
": This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."
Kessig Wolf84%
$0.18↓#27509↓0.00↓15.1 years↑
": This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."
Noble Panther84%
$0.30↑#29806↓0.07↓26.0 years↑
": This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."
Phyrexian Vindicator84%
$6.19↑#3168↑0.52↑3.7 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."
Lightning Wolf84%
$0.16↓#24664↓0.08↓4.9 years↓
": This creature gains first strike until end of turn. Activate only as a sorcery."
: This creature gains first strike until end of turn. Activate only as a sorcery."
Boreal Griffin83%
$0.14↓#26243↓0.00↓20.2 years↑
"
: This creature gains first strike until end of turn."
: This creature gains first strike until end of turn."