Swamp Mosquito 
Creature — Insect
$0.14 #19244 0.07 30.2 years
Flying
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 Swamp Mosquito 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↑#222140.32↑29.6 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Crypt Cobra100%
$0.16↑#28456↓0.75↑29.9 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Pestilent Syphoner94%
$0.29↑#6479↑0.50↑3.6 years↓
"Flying"
Plague Stinger88%
$0.38↑#4791↑0.46↑15.9 years↓
"Flying"
Murk Dwellers85%
$0.06↓#31512↓0.20↑32.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Abyssal Nightstalker84%
$0.49↑#27591↓0.27↑28.2 years↓
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Guiltfeeder82%
$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."
Keeper of Tresserhorn80%
$0.64↑#31458↓0.25↑30.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Elusive Tormentor // Insidious Mist78%
$0.21↑#207320.0710.4 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Stromgald Spy77%
$0.14#30024↓0.69↑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."
Mindstab Thrull77%
$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."
Ophidian76%
$0.12↓#26531↓0.25↑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 Cruelties75%
$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 Paladin75%
$0.26↑#28954↓0.1430.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Dauthi Mindripper75%
$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."
Coral Fighters74%
$0.14#27638↓0.0629.9 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↑0.65↑15.6 years↓
"Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn."
Goblin Vandal74%
$0.25↑#227520.28↑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."
Merchant Ship73%
$43.78↑#28544↓0.42↑32.7 years↑
"Whenever this creature attacks and isn't blocked, you gain 2 life."
Eternal of Harsh Truths73%
$0.20↑#177820.32↑9.1 years↓
"Whenever this creature attacks and isn't blocked, draw a card."