Necrogen Mists 
Enchantment
$11.47 #6311 1.13 22.9 years
At the beginning of each player's upkeep, that player discards a card.
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Cards similar to Necrogen Mists 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.
Stony-Voiced Goblins88%
$0.26↓#20009↓0.00↓0.1 years↓
"When this creature enters, each opponent discards a card."
Hecteyes88%
$0.20↓#7595↓0.13↓1.2 years↓
"When this creature enters, each opponent discards a card."
Nezumi Informant88%
$0.38↓#4695↑0.26↓3.4 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple88%
$0.18↓#4589↑0.28↓5.6 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle88%
$0.15↓#4046↑0.29↓4.5 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend88%
$0.15↓#21269↓0.31↓27.9 years↑
"When this creature enters, each opponent discards a card."
Burglar Rat88%
$0.22↓#2600↑0.30↓7.9 years↓
"When this creature enters, each opponent discards a card."
Liliana's Specter86%
$0.14↓#9807↓0.60↓16.1 years↓
"When this creature enters, 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."
Oppression86%
$3.80↓#3197↑1.66↑27.9 years↑
"Whenever a player casts a spell, that player discards a card."
Mind Rot83%
$0.03↓#12522↓0.41↓29.3 years↑
"Target player discards two cards."
Ravenous Rats82%
$0.12↓#11730↓0.37↓28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official82%
$0.14↓#15922↓0.53↓27.3 years↑
"When this creature enters, target opponent discards a card."
Green Goblin, Back for More82%
$0.74↓#19491↓0.00↓0.2 years↓
"At the beginning of combat on your turn, you may discard a card. If you do, each opponent discards a card."
Brutal Nightstalker82%
$0.63↓#31525↓0.53↓28.2 years↑
"When this creature enters, you may have target opponent discard a card."
Abyssal Horror81%
$0.48↓#24460↓0.73↓27.9 years↑
"When this creature enters, target player discards two cards."
Enemy of Enlightenment80%
$0.07↓#25904↓0.36↓6.6 years↓
"At the beginning of your upkeep, each player discards a card."
Miasmic Mummy80%
$0.07↓#12605↓0.56↓9.4 years↓
"When this creature enters, each player discards a card."
Sibsig Icebreakers80%
$0.06↓#23694↓0.24↓11.4 years↓
"When this creature enters, each player discards a card."
Ebon Dragon80%
$8.13↓#27838↓0.47↓29.3 years↑
"When this creature enters, you may have target opponent discard a card."