Blazing Sunsteel 
Artifact — Equipment
$9.52 #6372 0.12 5.9 years
Equipped creature gets +1/+0 for each opponent you have.
Whenever equipped creature is dealt damage, it deals that much damage to any target.
Equip 
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Cards similar to Blazing Sunsteel 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.
Spitemare94%
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"Whenever this creature is dealt damage, it deals that much damage to any target."
Black Panther, Most Dangerous90%
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"Whenever this card is dealt damage, he deals that much damage to any other target."
Wrathful Red Dragon87%
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"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Magmatic Force86%
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"At the beginning of each upkeep, this creature deals 3 damage to any target."
Ill-Tempered Loner // Howlpack Avenger85%
$0.45↓#72180.124.9 years
"Whenever this creature is dealt damage, it deals that much damage to any target."
Mogg Maniac84%
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"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wrathful Raptors84%
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"Whenever a Dinosaur you control is dealt damage, it deals that much damage to any target that isn't a Dinosaur."
Brash Taunter82%
$2.22↓#812↑0.58↑6.3 years
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Jennifer Walters // The Sensational She-Hulk82%
$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 Souls82%
$1.65↓#16280↓0.1328.6 years↑
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."
Screaming Nemesis82%
$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."
Tephraderm82%
$0.25↓#28361↓0.1224.0 years↑
"Whenever a creature deals damage to this creature, this creature deals that much damage to that creature."
Lion Heart81%
$0.20↓#13591↓0.00↓1.4 years↓
"Equipped creature gets +2/+1."
+2 more matching lines
Donna Noble78%
$0.37↓#11025↓0.063.0 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Fiendlash78%
$0.38↓#4958↑0.105.2 years
"Whenever equipped creature is dealt damage, it deals damage equal to its power to target player or planeswalker."
+1 more matching line
Kamahl, Pit Fighter78%
$0.20↓#18568↓0.1325.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Phyrexian Vindicator78%
$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."
Surestrike Trident78%
$1.54↓#14269↓0.1222.7 years↑
"Equip "
"
Truefire Captain78%
$0.23↓#12831↓0.158.0 years↑
"Whenever this creature is dealt damage, it deals that much damage to target player."