Song of Stupefaction 

Enchantment — Aura
$0.10 #24776 0.14 2.8 years
Enchant creature or Vehicle
When this Aura enters, you may mill two cards. (You may put the top two cards of your library into your graveyard.)
Fathomless descent — Enchanted permanent gets -X/-0, where X is the number of permanent cards in your graveyard.
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Cards similar to Song of Stupefaction 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.
Mists of Littjara92%
$0.02↓#29910↓0.29↑5.6 years↑
"Enchant creature or Vehicle"
+1 more matching line
Fear of Death90%
$0.11↑#226240.054.8 years↑
"When this Aura enters, mill two cards."
+1 more matching line
Black Widow, Daring Operative82%
$2.54↑#227830.00↓0.2 years↓
"When this card enters, mill three cards."
Mineshaft Spider80%
$0.21↑#19625↑0.27↑2.8 years
"When this creature enters, you may mill two cards."
Deathcap Marionette80%
$0.16↑#10955↑0.00↓2.8 years
"When this creature enters, you may mill two cards."
Spontaneous Mutation79%
$0.07↓#208110.0610.1 years↑
"Enchanted creature gets -X/-0, where X is the number of cards in your graveyard."
Necromancer's Assistant78%
$0.07↓#230750.00↓12.1 years↑
"When this creature enters, mill three cards."