Altar of the Brood 
Artifact
$9.77 #1415 0.88 11.9 years
Whenever another permanent you control enters, each opponent mills a card.
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Cards similar to Altar of the Brood 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.
Iceberg Cancrix82%
$0.25↓#12911↓0.47↓7.2 years↓
"Whenever another snow permanent you control enters, you may have target player mill two cards."
Ruin Crab76%
$1.09↓#12810.54↓5.9 years↓
"Whenever a land you control enters, each opponent mills three cards."
Sphinx Mindbreaker76%
$1.68↓#15806↓0.20↓6.6 years↓
"When this creature enters, each opponent mills ten cards."
Amareth, the Lustrous76%
$0.37↓#11761↓0.29↓5.8 years↓
"Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand."
Psychic Corrosion72%
$4.45↓#1780↓0.61↓8.1 years↓
"Whenever you draw a card, each opponent mills two cards."
Nimana Skydancer70%
$0.08↓#22966↓0.20↓5.9 years↓
"When this creature enters, target opponent mills two cards."