Oppression 
Enchantment
$3.35 #3200 1.76 28.0 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%
$4.87↑#6249↓1.22↓23.0 years↓
"At the beginning of each player's upkeep, that player discards a card."
Unnerve83%
$0.12↓#12359↓0.47↓28.0 years
"Each opponent discards two cards."
Cabal Shrine74%
$0.31↓#31450↓0.50↓25.1 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%
$0.04↓#12672↓0.32↓29.5 years↑
"Target player discards two cards."
Bereavement73%
$0.27↓#26714↓1.00↓28.0 years
"Whenever a green creature dies, its controller discards a card."
Nezumi Informant72%
$0.34↓#4740↓0.32↓3.5 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple72%
$0.16↓#4582↓0.44↓5.7 years↓
"When this creature enters, each opponent discards a card."
Hecteyes72%
$0.21↓#7077↓0.47↓1.4 years↓
"When this creature enters, each opponent discards a card."
Burglar Rat72%
$0.21↓#26040.33↓8.0 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend72%
$0.12↓#21521↓0.29↓28.0 years
"When this creature enters, each opponent discards a card."
Rank Rat72%
$0.23↓#20488↓0.36↓0.0 years↓
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins72%
$0.12↓#16069↓0.51↓0.2 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle72%
$0.14↓#4013↓0.32↓4.7 years↓
"When this creature enters, each opponent discards a card."
Painful Quandary72%
$1.50↓#1196↑1.45↓16.1 years↓
"Whenever an opponent casts a spell, that player loses 5 life unless they discard a card."
Liliana's Specter70%
$0.13↓#9854↓0.27↓16.3 years↓
"When this creature enters, each opponent discards a card."
Cunning Lethemancer70%
$5.25↑#7993↓0.79↓18.0 years↓
"At the beginning of your upkeep, each player discards a card."