Fleet Swallower 
Creature — Fish
$1.10 #5117 0.95 9.1 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%
$3.35↑#2759↑1.10↑25.1 years↑
"Target player mills half their library, rounded down."
Lord Xander, the Collector86%
$2.70↑#7665↓1.24↑4.5 years↓
"Whenever this card attacks, defending player mills half their library, rounded down."
Terisian Mindbreaker86%
$1.15↑#48430.83↓3.9 years↓
"Whenever this creature attacks, defending player mills half their library, rounded up."
Cut Your Losses84%
$1.45↑#3391↑0.944.5 years↓
"Target player mills half their library, rounded down."
Nemesis of Reason80%
$3.08↑#46300.68↓17.5 years↑
"Whenever this creature attacks, defending player mills ten cards."
Veteran Ice Climber80%
$0.20↓#14337↓0.07↓1.5 years↓
"Whenever this creature attacks, up to one target player mills cards equal to this creature's power."
Cathartic Adept80%
$0.24↓#16669↓0.00↓18.0 years↑
"
: Target player mills a card."
: Target player mills a card."
Jidoor, Aristocratic Capital // Overture79%
$1.13↑#2147↑0.60↓1.4 years↓
"Target opponent mills half their library, rounded down."
Restless Reef78%
$1.87↑#42130.07↓2.9 years↓
"Whenever this land attacks, target player mills four cards."
Merrow Witsniper77%
$0.28↓#26503↓0.18↓18.7 years↑
"When this creature enters, target player mills a card."
Merfolk Mesmerist77%
$0.15↓#24843↓0.33↓15.3 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Vedalken Entrancer77%
$0.13↓#26441↓0.18↓21.2 years↑
", : Target player mills two cards."
, : Target player mills two cards."
Millstone77%
$0.15↓#12535↓0.07↓32.6 years↑
"
, : Target player mills two cards."
, : Target player mills two cards."
Returned Centaur76%
$0.05↓#21613↓0.19↓13.1 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer76%
$0.08↓#24305↓0.07↓8.5 years
"When this creature enters, target player mills four cards."
Screaming Phantom75%
$0.13↓#22688↓0.00↓2.9 years↓
"Whenever this creature attacks, mill a card."
Mysterio's Phantasm75%
$0.10↓#17595↓0.00↓1.1 years↓
"Whenever this creature attacks, mill a card."
Tower of Murmurs75%
$0.35↓#27730↓0.12↓23.0 years↑
"
, : Target player mills eight cards."
, : Target player mills eight cards."
Kitsune's Technique74%
$0.71↓#8598↓0.880.6 years↓
"Target opponent mills half their library, rounded up."
Screaming Swarm74%
$0.24↓#17852↓0.13↓4.9 years↓
"Whenever you attack with one or more creatures, target player mills that many cards."