Marsh Viper 
Creature — Snake
$0.09 #22925 0.42 32.1 years
Whenever this creature deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)
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Cards similar to Marsh Viper 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.
Pit Scorpion99%
$0.09#28515↓0.86↑32.3 years
"Whenever this creature deals damage to a player, that player gets a poison counter."
Sabertooth Cobra88%
$0.18↑#198540.4729.9 years↓
"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 
before that step."
before that step."
Serpent Generator86%
$0.48↑#237940.21↓32.3 years
"
, 
: Create a 1/1 colorless Snake artifact creature token. It has "Whenever this creature deals damage to a player, that player gets a poison counter.""
, : Create a 1/1 colorless Snake artifact creature token. It has "Whenever this creature deals damage to a player, that player gets a poison counter.""
Reaper of Sheoldred84%
$0.89↑#12229↑0.61↑15.3 years↓
"Whenever a source deals damage to this creature, that source's controller gets a poison counter."
Phyrexian Vatmother82%
$0.38↑#13845↑0.5015.6 years↓
"At the beginning of your upkeep, you get a poison counter."
Bilious Skulldweller81%
$0.39↑#4526↑0.20↓3.6 years↓
"Toxic 1"
Ichorspit Basilisk81%
$0.30↑#8142↑0.57↑3.6 years↓
"Toxic 1"
Jawbone Duelist81%
$0.29↑#9922↑0.15↓3.6 years↓
"Toxic 1"
Pestilent Syphoner80%
$0.29↑#6479↑0.503.6 years↓
"Toxic 1"
Ichor Rats79%
$2.17↑#3341↑0.4715.9 years↓
"When this creature enters, each player gets a poison counter."
Necrogen Rotpriest76%
$0.18↑#6912↑0.71↑3.6 years↓
"Whenever a creature you control with toxic deals combat damage to a player, that player gets an additional poison counter."
Flesh Reaver76%
$0.26↑#10518↑0.21↓27.9 years↓
"Whenever this creature deals damage to a creature or opponent, this creature deals that much damage to you."
Virulent Silencer75%
$0.30↑#7457↑0.58↑1.1 years↓
"Whenever a nontoken artifact creature you control deals combat damage to a player, that player gets two poison counters."
Etali, Primal Conqueror // Etali, Primal Sickness74%
$25.50↑#799↑1.65↑3.4 years↓
"Whenever this card deals combat damage to a player, they get that many poison counters."
Bellowing Fiend74%
$0.25↑#30528↓0.07↓28.9 years↓
"Whenever this creature deals damage to a creature, this creature deals 3 damage to that creature's controller and 3 damage to you."
Spiritmonger74%
$0.16↑#232610.60↑25.3 years↓
"Whenever this creature deals damage to a creature, put a +1/+1 counter on this creature."
Crawling Chorus74%
$0.29↑#6383↑0.09↓3.6 years↓
"Toxic 1"
Stinging Hivemaster74%
$0.17↑#15784↑0.24↓3.6 years↓
"Toxic 1"
Reef Pirates74%
$0.15↑#274240.4430.9 years↓
"Whenever this creature deals damage to an opponent, that player mills a card."
Fynn, the Fangbearer73%
$0.18↑#2706↑1.15↑5.6 years↓
"Whenever a creature you control with deathtouch deals combat damage to a player, that player gets two poison counters."