Blood Reckoning 

Enchantment
$0.30 #12239 0.62 14.1 years
Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life.
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Cards similar to Blood Reckoning 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.
Marchesa's Decree98%
$0.81↑#7110↑0.05↓10.0 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Revenge of Ravens94%
$0.30#2839↑0.32↓6.9 years↓
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life and you gain 1 life."
Hissing Miasma94%
$2.52↑#98430.24↓20.6 years↑
"Whenever a creature attacks you, its controller loses 1 life."
Riddlekeeper90%
$10.37↑#100920.50↓15.2 years↑
"Whenever a creature attacks you or a planeswalker you control, that creature's controller mills two cards."
Isperia, Supreme Judge86%
$0.29↓#100290.25↓13.9 years
"Whenever a creature attacks you or a planeswalker you control, you may draw a card."
Slumbering Dragon84%
$2.08↑#124190.25↓14.1 years
"Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on this creature."
Circle of Flame84%
$0.16↓#9266↑0.33↓15.1 years
"Whenever a creature without flying attacks you or a planeswalker you control, this enchantment deals 1 damage to that creature."
Kazuul, Tyrant of the Cliffs82%
$0.18↓#1867↑0.29↓16.6 years↑
"Whenever a creature an opponent controls attacks, if you're the defending player, create a 3/3 red Ogre creature token unless that creature's controller pays
."
Tomik, Wielder of Law80%
$0.31↑#7119↑0.45↓2.6 years↓
"Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, that opponent loses 3 life and you draw a card."
Baird, Steward of Argive80%
$0.22↓#2557↑0.47↓8.4 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Forbidding Spirit79%
$0.16↓#16059↓0.16↓7.6 years↓
"When this creature enters, until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Ever-Watching Threshold76%
$0.25↓#8812↑0.38↓8.1 years↓
"Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card."
Archon of Absolution76%
$0.16↓#7560↑0.41↓6.9 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures."
Lightmine Field76%
$5.79↑#112230.5316.4 years↑
"Whenever one or more creatures attack, this enchantment deals damage to each of those creatures equal to the number of attacking creatures."
Ghostly Prison75%
$5.30↑#162↑1.07↑21.9 years↑
"Creatures can't attack you unless their controller pays
for each creature they control that's attacking you."
Mangara, the Diplomat74%
$0.37↑#612↑0.45↓6.2 years↓
"Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, draw a card."
Orim's Prayer74%
$0.52↑#17874↓0.12↓28.9 years↑
"Whenever one or more creatures attack you, you gain 1 life for each attacking creature."
Search the Premises74%
$0.26↓#7360↑0.645.3 years↓
"Whenever a creature attacks you or a planeswalker you control, investigate."
Sphere of Safety74%
$3.81↑#672↑1.17↑13.9 years
"Creatures can't attack you or planeswalkers you control unless their controller pays
for each of those creatures, where X is the number of enchantments you control."