Miasmic Mummy 
Creature — Zombie Jackal
$0.08 #12657 0.59 9.5 years
When this creature enters, each player discards a card.
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Cards similar to Miasmic Mummy 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.
Sibsig Icebreakers100%
$0.08#23968↓0.20↓11.6 years↑
"When this creature enters, each player discards a card."
Cunning Lethemancer95%
$5.25↑#7993↑0.79↑18.0 years↑
"At the beginning of your upkeep, each player discards a card."
Rotting Rats92%
$0.76↑#8627↑0.5317.7 years↑
"When this creature enters, each player discards a card."
Marsh Crocodile91%
$0.23↑#29823↓0.28↓25.7 years↑
"When this creature enters, each player discards a card."
Delirium Skeins91%
$0.28↑#7362↑0.6920.5 years↑
"Each player discards three cards."
Earsplitting Rats90%
$0.18↑#22059↓0.21↓24.4 years↑
"When this creature enters, each player discards a card."
Enemy of Enlightenment90%
$0.06↓#26217↓0.556.7 years↓
"At the beginning of your upkeep, each player discards a card."
Sire of Insanity88%
$0.49↑#9050↑1.70↑13.5 years↑
"At the beginning of each end step, each player discards their hand."
Mind Rake86%
$0.23↑#8432↑0.33↓7.4 years↓
"Target player discards two cards."
Serum Raker86%
$0.03↓#31119↓0.18↓15.7 years↑
"When this creature dies, each player discards a card."
Rankle's Prank85%
$0.39↑#6833↑1.06↑3.1 years↓
"• Each player discards two cards."
Rix Maadi, Dungeon Palace84%
$0.24↑#10094↑0.22↓20.5 years↑
"
, 
: Each player discards a card. Activate only as a sorcery."
, : Each player discards a card. Activate only as a sorcery."
Stronghold Rats84%
$0.47↑#7661↑0.47↓19.5 years↑
"Whenever this creature deals combat damage to a player, each player discards a card."
Kardur's Vicious Return83%
$0.23↑#18644↓0.09↓5.7 years↓
"Each player discards a card."
Creeping Dread83%
$0.18↑#144340.30↓10.5 years↑
"At the beginning of your upkeep, each player discards a card. Each opponent who discarded a card that shares a card type with the card you discarded loses 3 life."
Mindslicer82%
$0.44↑#5722↑1.36↑25.1 years↑
"When this creature dies, each player discards their hand."
Nezumi Informant81%
$0.34↑#4740↑0.32↓3.5 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple81%
$0.16↑#4582↑0.44↓5.7 years↓
"When this creature enters, each opponent discards a card."
Hecteyes81%
$0.21↑#7077↑0.47↓1.4 years↓
"When this creature enters, each opponent discards a card."
Burglar Rat81%
$0.21↑#2604↑0.33↓8.0 years↓
"When this creature enters, each opponent discards a card."