Suq'Ata Assassin {1}{B}{B}
Creature — Human Assassin
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
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 that do something similar 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.
Swamp Mosquito 100%
$0.72#18867
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Crypt Cobra 100%
$0.19#28153
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Pit Scorpion 84%
$0.09#28152
"Whenever this creature deals damage to a player, that player gets a poison counter."
Sabertooth Cobra 84%
$0.18#19465
"Whenever this creature deals damage to a player, that player gets a poison counter. The player gets another poison counter at the beginning of their next upkeep unless they pay {2} before that step."
Reaper of Sheoldred 83%
$0.77#11992
"Whenever a source deals damage to this creature, that source's controller gets a poison counter."
Necrogen Rotpriest 82%
$0.12#6864
"Whenever a creature you control with toxic deals combat damage to a player, that player gets an additional poison counter."
Norn's Decree 81%
$8.55#4047
"Whenever a player attacks, if one or more players being attacked are poisoned, the attacking player draws a card."
Xantid Swarm 80%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."