Backfire 
Enchantment — Aura
$0.28 #23301 0.21 32.4 years
Enchant creature
Whenever enchanted creature deals damage to you, this Aura deals that much damage to that creature's controller.
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Cards similar to Backfire 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.
Wanderlust86%
$0.14↓#29655↓0.07↓33.2 years
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 1 damage to that player."
Spiteful Shadows80%
$0.16↓#227320.2814.7 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to its controller."
Parasitic Bond80%
$0.40↑#29828↓0.1928.0 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 2 damage to that player."
Feedback80%
$0.22↓#28299↓0.1733.2 years
"At the beginning of the upkeep of enchanted enchantment's controller, this Aura deals 1 damage to that player."
Tephraderm80%
$0.25↓#28361↓0.1224.0 years↓
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Binding Agony78%
$0.18↓#230700.00↓30.0 years↓
"Whenever enchanted creature is dealt damage, this Aura deals that much damage to that creature's controller."
Pain for All78%
$1.05↑#2767↑0.43↑1.2 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Festering Wound78%
$0.29↑#225930.2827.4 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals X damage to that player, where X is the number of infection counters on this Aura."
+1 more matching line
Cursed Land77%
$0.21↓#255070.1633.2 years
"At the beginning of the upkeep of enchanted land's controller, this Aura deals 1 damage to that player."
Guilty Conscience76%
$1.45↑#8102↑0.00↓23.4 years↓
"Whenever enchanted creature deals damage, this Aura deals that much damage to that creature."
Maddening Wind76%
$0.19↓#31439↓0.61↑31.4 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 2 damage to that player."
+1 more matching line
Donna Noble75%
$0.37↑#11025↑0.06↓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."
Insubordination74%
$0.08↓#277880.1727.0 years↓
"At the beginning of the end step of enchanted creature's controller, this Aura deals 2 damage to that player unless that creature attacked this turn."
Mogg Maniac74%
$0.32↑#11828↑0.33↑28.6 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."