Blazing Sunsteel 
Artifact — Equipment
$15.51 #6474 0.57 5.8 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%
$0.33↓#12410↓0.73↑18.1 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Boros Reckoner93%
$0.28↓#63420.17↓13.6 years↑
"Whenever this creature is dealt damage, it deals that much damage to any target."
Black Panther, Most Dangerous90%
$0.37↓#18833↓0.00↓0.2 years↓
"Whenever this card is dealt damage, he deals that much damage to any other target."
Wrathful Red Dragon87%
$6.44↓#2260↑0.44↓4.2 years↓
"Whenever a Dragon you control is dealt damage, it deals that much damage to any target that isn't a Dragon."
Magmatic Force86%
$0.28↓#10039↓0.09↓15.2 years↑
"At the beginning of each upkeep, this creature deals 3 damage to any target."
Ill-Tempered Loner // Howlpack Avenger85%
$0.41↓#71850.25↓4.8 years
"Whenever this creature is dealt damage, it deals that much damage to any target."
Mogg Maniac84%
$0.35↓#11772↓0.44↓28.5 years↑
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Wrathful Raptors84%
$5.11↓#2629↑0.32↓2.8 years↓
"Whenever a Dinosaur you control is dealt damage, it deals that much damage to any target that isn't a Dinosaur."
Brash Taunter82%
$1.61↓#790↑0.496.2 years
"Whenever this creature is dealt damage, it deals that much damage to target opponent."
Wall of Souls82%
$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."
Screaming Nemesis82%
$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."
Tephraderm82%
$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."
Lion Heart81%
$0.19↓#13651↓0.09↓1.2 years↓
"Equipped creature gets +2/+1."
+2 more matching lines
Jennifer Walters // The Sensational She-Hulk80%
$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."
Donna Noble78%
$0.42↓#10942↓0.502.9 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Kamahl, Pit Fighter78%
$0.18↓#18157↓0.5024.9 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Fiendlash78%
$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."
+1 more matching line
Truefire Captain78%
$0.24↓#12709↓0.20↓7.9 years↑
"Whenever this creature is dealt damage, it deals that much damage to target player."
Surestrike Trident76%
$1.50↓#14041↓0.08↓22.6 years↑
"Equip "
"
Mage Slayer76%
$1.65↓#4355↑0.25↓17.3 years↑
"Equip 
"
"