Serum Raker 
Creature — Phyrexian Drake
$0.03 #31119 0.18 15.7 years
Flying
When this creature dies, each player discards a card.
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Cards similar to Serum Raker 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.
Mindslicer96%
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"When this creature dies, each player discards their hand."
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"When this creature dies, each opponent discards a card."
+1 more matching line
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"When this creature dies, each opponent discards a card."
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$0.22↑#268430.00↓29.5 years↑
"When this creature dies, each opponent discards a card."
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"At the beginning of your upkeep, each player discards a card."
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"When this creature enters, each player discards a card."
Miasmic Mummy86%
$0.08↑#12657↑0.59↑9.5 years↓
"When this creature enters, each player discards a card."
Delirium Skeins85%
$0.28↑#7362↑0.69↑20.5 years↑
"Each player discards three cards."
Rottenheart Ghoul84%
$0.09↑#270770.00↓10.5 years↓
"When this creature dies, target player discards a card."
Deadbridge Shaman83%
$0.08↑#22912↑0.2111.3 years↓
"When this creature dies, target opponent discards a card."
Darkslick Drake83%
$0.14↑#280400.00↓16.1 years
"Flying"
Drainpipe Vermin82%
$0.11↑#13398↑0.07↓14.0 years↓
"When this creature dies, you may pay 
. If you do, target player discards a card."
. If you do, target player discards a card."
Enemy of Enlightenment82%
$0.06↑#262170.55↑6.7 years↓
"At the beginning of your upkeep, each player discards a card."
Sire of Insanity81%
$0.49↑#9050↑1.70↑13.5 years↓
"At the beginning of each end step, each player discards their hand."
Rix Maadi, Dungeon Palace80%
$0.24↑#10094↑0.2220.5 years↑
"
, 
: Each player discards a card. Activate only as a sorcery."
, : Each player discards a card. Activate only as a sorcery."
Mind Rake80%
$0.23↑#8432↑0.33↑7.4 years↓
"Target player discards two cards."
Rankle's Prank79%
$0.39↑#6833↑1.06↑3.1 years↓
"• Each player discards two cards."
Strongarm Tactics78%
$0.39↑#24373↑0.29↑24.0 years↑
"Each player discards a card. Then each player who didn't discard a creature card this way loses 4 life."
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$0.28↑#253460.00↓20.5 years↑
"Flying"
Exiled Boggart76%
$0.19↑#309020.06↓19.0 years↑
"When this creature dies, discard a card."