Mesmeric Orb 
Artifact
$17.44 #1096 1.47 23.0 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%
$0.58↓#23713↓0.18↓27.0 years↑
"At the beginning of each player's upkeep, that player mills a card."
Siren of the Silent Song78%
$0.21↓#18088↓0.57↓12.7 years↓
"Whenever this creature becomes untapped, each opponent discards a card, then each opponent mills a card."
Mindwrack Harpy78%
$0.22↓#7538↓0.20↓6.7 years↓
"At the beginning of combat on your turn, each player mills three cards."
Ghoulcaller's Bell76%
$0.28↓#6584↓0.29↓15.1 years↓
"
: Each player mills a card."
: Each player mills a card."
Wake Thrasher76%
$0.19↓#16641↓0.10↓18.2 years↓
"Whenever a permanent you control becomes untapped, this creature gets +1/+1 until end of turn."
Eye Collector74%
$0.16↓#10456↓0.16↓7.0 years↓
"Whenever this creature deals combat damage to a player, each player mills a card."
Sibsig Host74%
$0.09↓#25005↓0.24↓11.7 years↓
"When this creature enters, each player mills three cards."
Kragma Butcher73%
$0.11↓#23022↓0.00↓12.7 years↓
"Whenever this creature becomes untapped, it gets +2/+0 until end of turn."
Whetstone73%
$0.71↓#23863↓0.24↓28.0 years↑
"
: Each player mills two cards."
: Each player mills two cards."
Pheres-Band Tromper72%
$0.09↓#26717↓0.22↓12.7 years↓
"Whenever this creature becomes untapped, put a +1/+1 counter on it."
Shared Trauma70%
$0.43↓#19005↓0.26↓15.3 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."