Screaming Swarm 

Creature — Bird Horror
$0.24 #17852 0.13 4.9 years
Flying
Whenever you attack with one or more creatures, target player mills that many cards. (To mill a card, a player puts the top card of their library into their graveyard.)
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Cards similar to Screaming Swarm 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.
Bookwurm92%
$0.11↓#13269↑0.135.5 years
"
: Put this card from your graveyard into your library third from the top."
Champion of Stray Souls80%
$0.28↑#150700.1812.7 years↑
"

: Put this card from your graveyard on top of your library."
Fleet Swallower74%
$1.10↑#5117↑0.95↑9.1 years↑
"Whenever this creature attacks, target player mills half their library, rounded up."
Restless Reef74%
$1.87↑#4213↑0.072.9 years↓
"Whenever this land attacks, target player mills four cards."
Veteran Ice Climber73%
$0.20↓#143370.071.5 years↓
"Whenever this creature attacks, up to one target player mills cards equal to this creature's power."
Mindscour Dragon73%
$0.16↓#23379↓0.29↑11.7 years↑
"Whenever this creature deals combat damage to an opponent, target player mills four cards."
Shard of Broken Glass71%
$0.11↓#21506↓0.00↓10.5 years↑
"Whenever equipped creature attacks, you may mill two cards."
Nemesis of Reason70%
$3.08↑#4630↑0.68↑17.5 years↑
"Whenever this creature attacks, defending player mills ten cards."