Mindstab Thrull 
Creature — Thrull
$0.14 #26925 0.27 31.8 years
Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards.
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Cards similar to Mindstab Thrull 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.
Dauthi Mindripper98%
$0.28↑#229220.3328.9 years↓
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Abyssal Nightstalker95%
$0.49↑#275910.2728.2 years↓
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Thalakos Deceiver82%
$3.55↑#16252↑0.50↑28.5 years↓
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, gain control of target creature."
Murk Dwellers82%
$0.06↓#315120.2032.1 years
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Liliana's Steward80%
$0.17↑#18194↑0.306.2 years↓
"
, Sacrifice this creature: Target opponent discards a card. Activate only as a sorcery."
, Sacrifice this creature: Target opponent discards a card. Activate only as a sorcery."
Necrite80%
$0.11↓#287690.2931.8 years
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, destroy target creature defending player controls. It can't be regenerated."
Guiltfeeder79%
$1.43↑#6805↑0.50↑24.3 years↓
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Goblin Grenadiers79%
$0.14#255880.2529.2 years↓
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, destroy target creature and target land."
Shrieking Specter78%
$1.01↑#308680.47↑27.2 years↓
"Whenever this creature attacks, defending player discards a card."
Keeper of Tresserhorn78%
$0.64↑#314580.2530.2 years↓
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Crypt Cobra78%
$0.16↑#284560.75↑29.9 years↓
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Suq'Ata Assassin77%
$0.54↑#222140.3229.6 years↓
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Swamp Mosquito77%
$0.14#19244↑0.07↓30.2 years↓
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Elusive Tormentor // Insidious Mist76%
$0.21↑#20732↑0.07↓10.4 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Cloak of Confusion76%
$0.15↑#279060.00↓31.3 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."
Stromgald Spy74%
$0.14#300240.69↑30.2 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."
Haunted Cadaver74%
$0.13↓#277170.38↑23.9 years↓
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards three cards."
Lim-Dûl's Paladin74%
$0.26↑#289540.14↓30.2 years↓
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Brain Weevil74%
$0.09↓#226940.44↑14.9 years↓
"Sacrifice this creature: Target player discards two cards. Activate only as a sorcery."
Coral Fighters72%
$0.14#276380.06↓29.9 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."