Marsh Viper 
Creature — Snake
$0.08 #23235 0.59 32.2 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%
$0.08#278700.31↓32.4 years
"Whenever this creature deals damage to a player, that player gets a poison counter."
Sabertooth Cobra88%
$0.14↑#201860.47↓30.0 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%
$0.53↑#239370.12↓32.4 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%
$0.81↑#11897↑0.76↑15.4 years↓
"Whenever a source deals damage to this creature, that source's controller gets a poison counter."
Phyrexian Vatmother82%
$0.41↑#13699↑0.32↓15.7 years↓
"At the beginning of your upkeep, you get a poison counter."
Ichorspit Basilisk81%
$0.26↑#8276↑0.28↓3.7 years↓
"Toxic 1"
Jawbone Duelist81%
$0.29↑#10081↑0.00↓3.7 years↓
"Toxic 1"
Bilious Skulldweller81%
$0.35↑#4562↑0.09↓3.7 years↓
"Toxic 1"
Pestilent Syphoner80%
$0.32↑#6608↑0.20↓3.7 years↓
"Toxic 1"
Ichor Rats79%
$3.85↑#3296↑0.86↑16.1 years↓
"When this creature enters, each player gets a poison counter."
Necrogen Rotpriest76%
$0.19↑#7036↑0.633.7 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↑#10676↑0.00↓28.0 years↓
"Whenever this creature deals damage to a creature or opponent, this creature deals that much damage to you."
Virulent Silencer75%
$0.26↑#7285↑1.00↑1.2 years↓
"Whenever a nontoken artifact creature you control deals combat damage to a player, that player gets two poison counters."
Bellowing Fiend74%
$0.25↑#30834↓0.06↓29.0 years↓
"Whenever this creature deals damage to a creature, this creature deals 3 damage to that creature's controller and 3 damage to you."
Etali, Primal Conqueror // Etali, Primal Sickness74%
$26.11↑#813↑1.85↑3.5 years↓
"Whenever this card deals combat damage to a player, they get that many poison counters."
Spiritmonger74%
$0.13↑#236250.13↓25.4 years↓
"Whenever this creature deals damage to a creature, put a +1/+1 counter on this creature."
Reef Pirates74%
$0.18↑#278570.07↓31.1 years↓
"Whenever this creature deals damage to an opponent, that player mills a card."
Crawling Chorus74%
$0.32↑#6528↑0.29↓3.7 years↓
"Toxic 1"
Stinging Hivemaster74%
$0.17↑#15981↑0.06↓3.7 years↓
"Toxic 1"
Bloated Contaminator74%
$3.23↑#2623↑0.653.7 years↓
"Whenever this creature deals combat damage to a player, proliferate."