Oppression 
Enchantment
$3.80 #3197 1.66 27.9 years
Whenever a player casts a spell, that player discards a card.
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Cards similar to Oppression 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.
Necrogen Mists86%
$11.47↑#6311↓1.13↓22.9 years↓
"At the beginning of each player's upkeep, that player discards a card."
Unnerve83%
$0.13↓#12273↓0.47↓27.9 years
"Each opponent discards two cards."
Bereavement76%
$0.27↓#26468↓0.80↓27.9 years
"Whenever a green creature dies, its controller discards a card."
Cabal Shrine74%
$0.35↓#31094↓0.23↓24.9 years↓
"Whenever a player casts a spell, that player discards X cards, where X is the number of cards in all graveyards with the same name as that spell."
Mind Rot74%
$0.03↓#12522↓0.41↓29.3 years↑
"Target player discards two cards."
Virus Beetle72%
$0.15↓#4046↓0.29↓4.5 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend72%
$0.15↓#21269↓0.31↓27.9 years
"When this creature enters, each opponent discards a card."
Burglar Rat72%
$0.22↓#26000.30↓7.9 years↓
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins72%
$0.26↓#20009↓0.00↓0.1 years↓
"When this creature enters, each opponent discards a card."
Hecteyes72%
$0.20↓#7595↓0.13↓1.2 years↓
"When this creature enters, each opponent discards a card."
Nezumi Informant72%
$0.38↓#4695↓0.26↓3.4 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple72%
$0.18↓#4589↓0.28↓5.6 years↓
"When this creature enters, each opponent discards a card."
Painful Quandary72%
$1.65↓#1188↑1.26↓15.9 years↓
"Whenever an opponent casts a spell, that player loses 5 life unless they discard a card."
Putrefaction70%
$0.29↓#27714↓0.41↓26.9 years
"Whenever a player casts a green or white spell, that player discards a card."
Liliana's Specter70%
$0.14↓#9807↓0.60↓16.1 years↓
"When this creature enters, each opponent discards a card."
Cunning Lethemancer70%
$6.71↑#7987↓0.87↓17.9 years↓
"At the beginning of your upkeep, each player discards a card."