Crypt Cobra 
Creature — Snake
$0.16 #28456 0.75 29.9 years
Whenever this creature attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)
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Cards similar to Crypt Cobra 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.
Suq'Ata Assassin100%
$0.54↑#22214↑0.32↓29.6 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Swamp Mosquito100%
$0.14↓#19244↑0.07↓30.2 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Murk Dwellers86%
$0.06↓#315120.20↓32.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Abyssal Nightstalker84%
$0.49↑#275910.27↓28.2 years↓
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Keeper of Tresserhorn81%
$0.64↑#314580.25↓30.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Guiltfeeder81%
$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."
Elusive Tormentor // Insidious Mist78%
$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."
Stromgald Spy78%
$0.14↓#300240.6930.2 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."
Mindstab Thrull78%
$0.14↓#269250.27↓31.8 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Ophidian76%
$0.12↓#265310.25↓29.2 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."
Master of Cruelties76%
$4.25↑#3439↑1.15↑13.3 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."
Lim-Dûl's Paladin76%
$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."
Coral Fighters75%
$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."
Septic Rats74%
$0.47↑#10815↑0.6515.6 years↓
"Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn."
Dauthi Mindripper74%
$0.28↑#229220.33↓28.9 years↓
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Goblin Vandal74%
$0.25↑#22752↑0.28↓29.2 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."
Eternal of Harsh Truths74%
$0.20↑#17782↑0.32↓9.1 years↓
"Whenever this creature attacks and isn't blocked, draw a card."
Merchant Ship73%
$43.78↑#285440.42↓32.7 years↑
"Whenever this creature attacks and isn't blocked, you gain 2 life."
Floral Spuzzem72%
$3.82↑#307370.00↓32.3 years↑
"Whenever this creature attacks and isn't blocked, you may destroy target artifact defending player controls. If you do, this creature assigns no combat damage this turn."
Kukemssa Pirates72%
$1.96↑#22655↑0.50↓29.9 years
"Whenever this creature attacks and isn't blocked, you may gain control of target artifact defending player controls. If you do, this creature assigns no combat damage this turn."