Shrieking Specter {5}{B}
Creature — Specter
Flying
Whenever this creature attacks, defending player discards a card.
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Cards that do something similar 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.
Abyssal Nightstalker 98%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Burning-Tree Vandal 90%
$0.19#21076
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Null Group Biological Assets 90%
$0.08#25398
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Vaultbreaker 90%
$0.05#24386
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Eumidian Wastewaker 88%
$0.23#8218
"Whenever this creature attacks, you and defending player each discard a card or sacrifice a permanent. You draw a card for each land card put into a graveyard this way."
The Haunt of Hightower 88%
$2.82#7136
"Whenever this card attacks, defending player discards a card."
Stronghold Rats 87%
$0.72#7516
"Whenever this creature deals combat damage to a player, each player discards a card."
Xantid Swarm 87%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Okiba-Gang Shinobi 87%
$1.32#9668
"Whenever this creature deals combat damage to a player, that player discards two cards."
Lightning Skelemental 87%
$0.90#10605
"Whenever this creature deals combat damage to a player, that player discards two cards."
Silent Specter 87%
$0.53#22588
"Whenever this creature deals combat damage to a player, that player discards two cards."
Needle Specter 87%
$1.15#17350
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Dreamstealer 87%
$0.28#16148
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Stromgald Spy 86%
$0.15#29721
"Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn."
Sedraxis Specter 86%
$0.09#20249
"Whenever this creature deals combat damage to a player, that player discards a card."
+1 more matching line
Riptide Pilferer 86%
$0.17#23127
"Whenever this creature deals combat damage to a player, that player discards a card."
Headhunter 86%
$0.34#25945
"Whenever this creature deals combat damage to a player, that player discards a card."
Guul Draz Specter 86%
$0.21#18741
"Whenever this creature deals combat damage to a player, that player discards a card."
Orzhov Racketeers 86%
$0.22#24993
"Whenever this creature deals combat damage to a player, that player discards a card."