Oona's Blackguard 
Creature — Faerie Rogue
$0.38 #5711 0.26 18.6 years
Flying
Each other Rogue creature you control enters with an additional +1/+1 counter on it.
Whenever a creature you control with a +1/+1 counter on it deals combat damage to a player, that player discards a card.
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Cards similar to Oona's Blackguard 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.
Larceny88%
$0.26↓#16752↓0.99↑26.9 years↑
"Whenever a creature you control deals combat damage to a player, that player discards a card."
Headhunter88%
$0.32↓#26289↓0.88↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Silent Specter88%
$0.53↑#23044↓0.80↑23.9 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Blazing Specter86%
$0.66↑#20741↓0.2525.9 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Riptide Pilferer86%
$0.15↓#23532↓0.3319.6 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Needle Specter84%
$1.11↑#17747↓0.43↑18.1 years
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Orzhov Racketeers84%
$0.04↓#25548↓0.337.6 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Specter's Shroud83%
$0.30↓#21053↓0.3222.6 years↑
"Whenever equipped creature deals combat damage to a player, that player discards a card."
Cabal Slaver82%
$0.26↓#25500↓0.13↓23.9 years↑
"Whenever a Goblin deals combat damage to a player, that player discards a card."
Pain Magnification82%
$1.04↑#12930↓0.88↑20.3 years↑
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Chilling Apparition81%
$0.30↓#26566↓0.14↓26.3 years↑
"Whenever this creature deals combat damage to a player, that player discards a card."
Okiba-Gang Shinobi80%
$1.06↑#9913↓0.59↑21.6 years↑
"Whenever this creature deals combat damage to a player, that player discards two cards."
Fell Flagship80%
$0.40↑#12331↓0.67↑8.9 years↓
"Whenever this Vehicle deals combat damage to a player, that player discards a card."
Sedraxis Specter80%
$0.09↓#20658↓0.41↑17.9 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Wei Night Raiders80%
$34.72↑#26345↓0.89↑27.3 years↑
"Whenever this creature deals damage to an opponent, that player discards a card."
Liliana's Reaver80%
$0.42↑#10295↓0.3313.1 years↓
"Whenever this creature deals combat damage to a player, that player discards a card and you create a tapped 2/2 black Zombie creature token."
Screeching Buzzard80%
$0.04↓#27062↓0.42↑23.9 years↑
"Flying"
Banshee of the Dread Choir79%
$0.87↑#12654↓0.64↑10.8 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Zhang Liao, Hero of Hefei79%
$34.19↑#30030↓0.50↑27.3 years↑
"Whenever this card deals damage to an opponent, that opponent discards a card."
Stronghold Rats79%
$0.66↑#7628↓0.37↑19.3 years
"Whenever this creature deals combat damage to a player, each player discards a card."