Fraying Sanity 

Enchantment — Aura Curse
$0.52 #2940 0.64 9.3 years
Enchant player
At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn.
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Cards similar to Fraying Sanity 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.
Curse of the Bloody Tome84%
$0.22↓#12919↓0.44↓15.1 years↑
"At the beginning of enchanted player's upkeep, that player mills two cards."
+1 more matching line
Keening Stone76%
$0.34↓#9604↓0.94↑16.5 years↑
"
,
: Target player mills X cards, where X is the number of cards in that player's graveyard."
Crawling Infestation73%
$0.24↓#4674↓0.10↓4.9 years↓
"At the beginning of your upkeep, you may mill two cards."