Doomsday Specter 
Creature — Specter
$0.36 #23192 0.12 25.7 years
Flying
When this creature enters, return a blue or black creature you control to its owner's hand.
Whenever this creature deals combat damage to a player, look at that player's hand and choose a card from it. The player discards that card.
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Cards similar to Doomsday Specter 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.
Marsh Crocodile88%
$0.23↓#29823↓0.28↑25.7 years
"When this creature enters, return a blue or black creature you control to its owner's hand."
Cavern Harpy86%
$0.26↓#16797↑0.33↑25.7 years
"When this creature enters, return a blue or black creature you control to its owner's hand."
Silent Specter80%
$0.51↑#234000.37↑24.1 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
+1 more matching line
Hollow Specter80%
$0.43↑#249290.40↑23.7 years↓
"Whenever this creature deals combat damage to a player, you may pay 
. If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card."
. If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card."
Headhunter80%
$0.30↓#265140.28↑24.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Blazing Specter78%
$0.68↑#210290.44↑26.0 years
"Whenever this creature deals combat damage to a player, that player discards a card."
Infernal Kirin78%
$2.30↑#17103↑0.1921.4 years↓
"Flying"
Okiba-Gang Shinobi78%
$1.06↑#10175↑0.57↑21.7 years↓
"Whenever this creature deals combat damage to a player, that player discards two cards."
Shivan Wurm78%
$1.97↑#263190.28↑25.7 years
"When this creature enters, return a red or green creature you control to its owner's hand."
Blim, Comedic Genius78%
$0.27↓#11422↑0.31↑5.9 years↓
"Flying"
Ghastlord of Fugue78%
$1.29↑#199720.35↑18.5 years↓
"Whenever this creature deals combat damage to a player, that player reveals their hand. You choose a card from it. That player exiles that card."
Silver Drake77%
$0.14↓#30253↓0.27↑26.8 years↑
"When this creature enters, return a white or blue creature you control to its owner's hand."
Riptide Pilferer77%
$0.13↓#238560.2119.7 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Needle Specter76%
$1.12↑#18077↑0.56↑18.2 years↓
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Orzhov Racketeers76%
$0.05↓#258490.077.7 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Sedraxis Specter76%
$0.10↓#209760.24↑18.0 years↓
"Whenever this creature deals combat damage to a player, that player discards a card."
Lava Zombie75%
$0.20↓#30172↓0.0525.7 years
"When this creature enters, return a black or red creature you control to its owner's hand."
Pain Magnification75%
$0.83↑#13277↑0.59↑20.5 years↓
"Whenever an opponent is dealt 3 or more damage by a single source, that player discards a card."
Screeching Buzzard75%
$0.04↓#273260.1124.0 years↓
"Flying"
Jagged Poppet74%
$0.17↓#227440.38↑20.5 years↓
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage."