Riddlekeeper 
Creature — Homunculus
$10.37 #10092 0.50 15.2 years
Whenever a creature attacks you or a planeswalker you control, that creature's controller mills two cards.
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Cards similar to Riddlekeeper 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.
Blood Reckoning90%
$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."
Marchesa's Decree88%
$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."
Isperia, Supreme Judge85%
$0.29↓#100290.25↓13.9 years↓
"Whenever a creature attacks you or a planeswalker you control, you may draw a card."
Revenge of Ravens84%
$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 Miasma82%
$2.52↓#98430.24↓20.6 years↑
"Whenever a creature attacks you, its controller loses 1 life."
Slumbering Dragon82%
$2.08↓#12419↓0.25↓14.1 years↓
"Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on this creature."
Circle of Flame81%
$0.16↓#92660.33↓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 Cliffs80%
$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 
."
."
Baird, Steward of Argive78%
$0.22↓#2557↑0.478.4 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays 
for each of those creatures."
for each of those creatures."
Forbidding Spirit78%
$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."
for each of those creatures."
Ever-Watching Threshold75%
$0.25↓#88120.38↓8.1 years↓
"Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card."
Archon of Absolution74%
$0.16↓#7560↑0.416.9 years↓
"Creatures can't attack you or planeswalkers you control unless their controller pays for each of those creatures."
for each of those creatures."
Mangara, the Diplomat73%
$0.37↓#612↑0.456.2 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."
Cunning Rhetoric73%
$2.19↓#2624↑0.36↓5.4 years↓
"Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it."
Sphere of Safety73%
$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."
for each of those creatures, where X is the number of enchantments you control."
Ghostly Prison72%
$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."
for each creature they control that's attacking you."
Lightmine Field72%
$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."
Search the Premises72%
$0.26↓#7360↑0.64↑5.3 years↓
"Whenever a creature attacks you or a planeswalker you control, investigate."
Norn's Annex70%
$4.06↓#1957↑0.63↑15.3 years
"Creatures can't attack you or planeswalkers you control unless their controller pays 
for each of those creatures."
for each of those creatures."
Orim's Prayer70%
$0.52↓#17874↓0.12↓28.9 years↑
"Whenever one or more creatures attack you, you gain 1 life for each attacking creature."