Fleet Swallower 
Creature — Fish
$1.28 #4941 0.70 8.9 years
Whenever this creature attacks, target player mills half their library, rounded up.
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Cards similar to Fleet Swallower 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.
Traumatize90%
$2.34↑#2742↑1.05↑24.9 years↑
"Target player mills half their library, rounded down."
Lord Xander, the Collector86%
$2.63↑#7550↓1.08↑4.4 years↓
"Whenever this card attacks, defending player mills half their library, rounded down."
Cut Your Losses85%
$1.66↑#3320↑0.744.4 years↓
"Target player mills half their library, rounded down."
Terisian Mindbreaker84%
$1.53↑#46600.89↑3.8 years↓
"Whenever this creature attacks, defending player mills half their library, rounded up."
Nemesis of Reason80%
$3.24↑#45320.51↓17.3 years↑
"Whenever this creature attacks, defending player mills ten cards."
Veteran Ice Climber80%
$0.27↓#14388↓0.20↓1.4 years↓
"Whenever this creature attacks, up to one target player mills cards equal to this creature's power."
Cathartic Adept80%
$0.25↓#16403↓0.00↓17.9 years↑
"
: Target player mills a card."
: Target player mills a card."
Jidoor, Aristocratic Capital // Overture79%
$1.47↑#2230↑0.52↓1.2 years↓
"Target opponent mills half their library, rounded down."
Restless Reef78%
$1.85↑#40350.08↓2.8 years↓
"Whenever this land attacks, target player mills four cards."
Merrow Witsniper77%
$0.26↓#26272↓0.53↓18.6 years↑
"When this creature enters, target player mills a card."
Merfolk Mesmerist77%
$0.20↓#24570↓0.33↓15.1 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer77%
$0.12↓#26188↓0.27↓21.0 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Millstone77%
$0.18↓#12280↓0.28↓32.5 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Returned Centaur76%
$0.04↓#21302↓0.11↓12.9 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer76%
$0.08↓#24051↓0.718.4 years
"When this creature enters, target player mills four cards."
Kitsune's Technique75%
$1.10↓#9241↓0.00↓0.5 years↓
"Target opponent mills half their library, rounded up."
Screaming Phantom75%
$0.13↓#22110↓0.00↓2.8 years↓
"Whenever this creature attacks, mill a card."
Mysterio's Phantasm75%
$0.18↓#17526↓0.29↓1.0 years↓
"Whenever this creature attacks, mill a card."
Tower of Murmurs75%
$0.35↓#27475↓0.11↓22.9 years↑
"
, : Target player mills eight cards."
, : Target player mills eight cards."
Screaming Swarm74%
$0.21↓#17606↓0.53↓4.8 years↓
"Whenever you attack with one or more creatures, target player mills that many cards."