Mesmeric Orb 
Artifact
$17.06 #1082 1.41 22.9 years
Whenever a permanent becomes untapped, that permanent's controller mills a card.
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Cards similar to Mesmeric Orb 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.
Worry Beads83%
$0.64↓#23348↓0.54↓26.9 years↑
"At the beginning of each player's upkeep, that player mills a card."
Siren of the Silent Song78%
$0.18↓#17760↓0.35↓12.6 years↓
"Whenever this creature becomes untapped, each opponent discards a card, then each opponent mills a card."
Mindwrack Harpy78%
$0.21↓#7279↓0.27↓6.6 years↓
"At the beginning of combat on your turn, each player mills three cards."
Ghoulcaller's Bell76%
$0.27↓#6492↓0.39↓14.9 years↓
"
: Each player mills a card."
: Each player mills a card."
Wake Thrasher76%
$0.25↓#16375↓0.24↓18.1 years↓
"Whenever a permanent you control becomes untapped, this creature gets +1/+1 until end of turn."
Eye Collector74%
$0.16↓#10324↓0.06↓6.9 years↓
"Whenever this creature deals combat damage to a player, each player mills a card."
Sibsig Host74%
$0.11↓#24782↓0.33↓11.6 years↓
"When this creature enters, each player mills three cards."
Kragma Butcher73%
$0.12↓#22773↓0.56↓12.6 years↓
"Whenever this creature becomes untapped, it gets +2/+0 until end of turn."
Whetstone73%
$0.67↓#23760↓0.53↓27.9 years↑
"
: Each player mills two cards."
: Each player mills two cards."
Pheres-Band Tromper72%
$0.09↓#26373↓0.31↓12.6 years↓
"Whenever this creature becomes untapped, put a +1/+1 counter on it."
Shared Trauma70%
$0.42↓#18726↓0.60↓15.2 years↓
"Starting with you, each player may pay any amount of mana. Each player mills X cards, where X is the total amount of mana paid this way."