Rush of Knowledge 

Sorcery
$0.17 #9291 0.05 23.3 years
Draw cards equal to the greatest mana value among permanents you control.
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Cards similar to Rush of Knowledge 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.
One with the Machine86%
$0.22↑#2860↑0.27↑8.1 years↓
"Draw cards equal to the greatest mana value among artifacts you control."
Lunar Insight81%
$0.20↑#6918↑0.16↑1.8 years↓
"Draw a card for each different mana value among nonland permanents you control."
Traverse Eternity79%
$0.42↑#80150.47↑2.9 years↓
"Draw cards equal to the greatest mana value among historic permanents you control."
Morbid Curiosity78%
$0.18↑#82960.33↑9.9 years↓
"Draw cards equal to the mana value of the sacrificed permanent."
Heed the Mists76%
$0.19↑#25564↓0.40↑21.6 years↓
"Mill a card, then draw cards equal to the milled card's mana value."
Ugin's Insight75%
$0.20↑#91590.35↑10.9 years↓
"Scry X, where X is the greatest mana value among permanents you control, then draw three cards."
Sudden Insight74%
$0.06↓#22676↓0.29↑5.1 years↓
"Draw a card for each different mana value among nonland cards in your graveyard."
Stinging Study72%
$10.78↑#3366↑0.24↑5.4 years↓
"You draw X cards and you lose X life, where X is the mana value of a commander you own on the battlefield or in the command zone."
Interpret the Signs72%
$0.12↓#13914↓0.17↑12.3 years↓
"Scry 3, then reveal the top card of your library. Draw cards equal to that card's mana value."
Overwhelming Intellect70%
$0.22↑#17787↓0.76↑21.3 years↓
"Counter target creature spell. Draw cards equal to that spell's mana value."
Keruga, the Macrosage70%
$0.17#84630.31↑6.4 years↓
"When this card enters, draw a card for each other permanent you control with mana value 3 or greater."