Serum Raker 
Creature — Phyrexian Drake
$0.03 #30908 0.50 15.6 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%
$0.42↑#5709↑1.28↑24.9 years↑
"When this creature dies, each player discards their hand."
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$0.04↑#270620.4223.9 years↑
"When this creature dies, each opponent discards a card."
+1 more matching line
Elvish Doomsayer88%
$0.20↑#11624↑0.07↓5.8 years↓
"When this creature dies, each opponent discards a card."
Noxious Toad88%
$0.22↑#264890.31↓29.3 years↑
"When this creature dies, each opponent discards a card."
Cunning Lethemancer86%
$6.71↑#7987↑0.87↑17.9 years↑
"At the beginning of your upkeep, each player discards a card."
Miasmic Mummy86%
$0.07↑#12605↑0.569.4 years↓
"When this creature enters, each player discards a card."
Sibsig Icebreakers86%
$0.06↑#23694↑0.24↓11.4 years↓
"When this creature enters, each player discards a card."
Delirium Skeins85%
$0.27↑#7404↑0.70↑20.3 years↑
"Each player discards three cards."
Rottenheart Ghoul84%
$0.06↑#268740.00↓10.4 years↓
"When this creature dies, target player discards a card."
Deadbridge Shaman83%
$0.08↑#22754↑0.5311.1 years↓
"When this creature dies, target opponent discards a card."
Runewing83%
$0.15↑#282690.18↓13.9 years↓
"Flying"
Drainpipe Vermin82%
$0.12↑#13178↑0.00↓13.9 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%
$0.07↑#259040.36↓6.6 years↓
"At the beginning of your upkeep, each player discards a card."
Sire of Insanity80%
$0.48↑#8796↑1.58↑13.3 years↓
"At the beginning of each end step, each player discards their hand."
Rix Maadi, Dungeon Palace80%
$0.26↑#9865↑0.33↓20.3 years↑
"
, 
: Each player discards a card. Activate only as a sorcery."
, : Each player discards a card. Activate only as a sorcery."
Mind Rake80%
$0.27↑#8420↑0.16↓7.2 years↓
"Target player discards two cards."
Exiled Boggart79%
$0.13↑#305530.36↓18.9 years↑
"When this creature dies, discard a card."
Rankle's Prank79%
$0.38↑#6700↑0.523.0 years↓
"• Each player discards two cards."
Strongarm Tactics78%
$0.37↑#24283↑0.27↓23.9 years↑
"Each player discards a card. Then each player who didn't discard a creature card this way loses 4 life."
Kardur's Vicious Return76%
$0.24↑#18362↑0.505.6 years↓
"Each player discards a card."