Backfire 
Enchantment — Aura
$0.27 #23078 0.24 32.3 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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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%
$0.16↓#29360↓0.2733.1 years
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 1 damage to that player."
Spiteful Shadows80%
$0.18↓#225540.2414.6 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to its controller."
Parasitic Bond80%
$0.39↑#29449↓0.3327.9 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 2 damage to that player."
Feedback80%
$0.18↓#28073↓0.06↓33.1 years
"At the beginning of the upkeep of enchanted enchantment's controller, this Aura deals 1 damage to that player."
Tephraderm80%
$0.24↓#27989↓0.3123.9 years↓
"Whenever a spell deals damage to this creature, this creature deals that much damage to that spell's controller."
Brand of Ill Omen80%
$1.59↑#262730.93↑31.3 years↓
"Enchant creature"
Inevitable End79%
$0.17↓#194060.62↑6.6 years↓
"Enchant creature"
Binding Agony78%
$0.18↓#228330.2229.9 years↓
"Whenever enchanted creature is dealt damage, this Aura deals that much damage to that creature's controller."
+1 more matching line
Sun Clasp78%
$0.12↓#195800.04↓29.6 years↓
"Enchant creature"
Pain for All78%
$0.75↑#2976↑0.42↑1.1 years↓
"Whenever enchanted creature is dealt damage, it deals that much damage to each opponent."
Festering Wound78%
$0.28↑#223420.2827.2 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."
Pillory of the Sleepless78%
$0.11↓#187600.53↑20.6 years↓
"Enchant creature"
Morgul-Knife Wound78%
$0.16↓#14214↑0.293.2 years↓
"Enchant creature"
Cursed Land77%
$0.18↓#251450.05↓33.1 years
"At the beginning of the upkeep of enchanted land's controller, this Aura deals 1 damage to that player."
Guilty Conscience76%
$1.67↑#8238↑0.70↑23.3 years↓
"Whenever enchanted creature deals damage, this Aura deals that much damage to that creature."
+1 more matching line
Maddening Wind76%
$0.19↓#31175↓0.00↓31.3 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals 2 damage to that player."
Donna Noble75%
$0.42↑#10942↑0.50↑2.9 years↓
"Whenever this card or a creature it's paired with is dealt damage, this card deals that much damage to target opponent."
Mogg Maniac74%
$0.35↑#11772↑0.44↑28.5 years↓
"Whenever this creature is dealt damage, it deals that much damage to target opponent or planeswalker."
Insubordination74%
$0.11↓#274910.00↓26.9 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."
Wall of Souls74%
$2.06↑#16164↑0.2928.5 years↓
"Whenever this creature is dealt combat damage, it deals that much damage to target opponent or planeswalker."