Abyssal Nightstalker 
Creature — Nightstalker
$0.49 #27803 0.21 28.3 years
Whenever this creature attacks and isn't blocked, defending player discards a card.
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Cards similar to Abyssal Nightstalker 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.
Mindstab Thrull95%
$0.15↓#272520.39↑32.0 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Dauthi Mindripper93%
$0.27↓#229730.44↑29.0 years
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Shrieking Specter85%
$1.02↑#311480.2127.3 years↓
"Whenever this creature attacks, defending player discards a card."
Murk Dwellers85%
$0.07↓#317900.00↓32.2 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Crypt Cobra84%
$0.17↓#287160.1130.0 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Swamp Mosquito84%
$0.15↓#19522↑0.31↑30.4 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Suq'Ata Assassin84%
$0.55↑#226830.2729.7 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Guiltfeeder84%
$1.34↑#6926↑0.39↑24.4 years↓
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Cloak of Confusion83%
$0.14↓#281500.32↑31.4 years↑
"Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random."
Keeper of Tresserhorn82%
$0.58↑#318170.07↓30.4 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Stromgald Spy80%
$0.13↓#302560.39↑30.4 years↑
"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."
Elusive Tormentor // Insidious Mist78%
$0.24↓#21177↑0.00↓10.5 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Coral Fighters76%
$0.13↓#278860.06↓30.0 years↑
"Whenever this creature attacks and isn't blocked, look at the top card of defending player's library. You may put that card on the bottom of that player's library."
Lim-Dûl's Paladin76%
$0.27↓#292230.00↓30.4 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Goblin Vandal76%
$0.24↓#231330.10↓29.4 years↑
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
Master of Cruelties76%
$4.42↑#3530↑1.14↑13.5 years↓
"Whenever this creature attacks a player and isn't blocked, that player's life total becomes 1. This creature assigns no combat damage this combat."
Ophidian75%
$0.12↓#267640.05↓29.4 years↑
"Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn."
The Haunt of Hightower74%
$1.79↑#7222↑0.59↑7.7 years↓
"Whenever this card attacks, defending player discards a card."
Merchant Ship74%
$42.56↑#287710.1232.8 years↑
"Whenever this creature attacks and isn't blocked, you gain 2 life."
Orcish Squatters74%
$0.35↓#280260.67↑31.4 years↑
"Whenever this creature attacks and isn't blocked, you may gain control of target land defending player controls for as long as you control this creature. If you do, this creature assigns no combat damage this turn."