Ichor Rats 
Creature — Phyrexian Rat
$3.85 #3296 0.86 16.1 years
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
When this creature enters, each player gets a poison counter.
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Cards similar to Ichor Rats 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.
Phyrexian Vatmother91%
$0.41↓#13699↓0.32↓15.7 years
"At the beginning of your upkeep, you get a poison counter."
+1 more matching line
Reaper of Sheoldred86%
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"Whenever a source deals damage to this creature, that source's controller gets a poison counter."
+1 more matching line
Carrion Call84%
$0.15↓#17006↓0.21↓16.1 years
"Create two 1/1 green Phyrexian Insect creature tokens with infect."
Bilious Skulldweller82%
$0.35↓#4562↓0.09↓3.7 years↓
"Toxic 1"
Ichorspit Basilisk82%
$0.26↓#8276↓0.28↓3.7 years↓
"Toxic 1"
Jawbone Duelist82%
$0.29↓#10081↓0.00↓3.7 years↓
"Toxic 1"
Phyrexian Swarmlord82%
$3.27↓#5055↓0.62↓15.4 years
"At the beginning of your upkeep, create a 1/1 green Phyrexian Insect creature token with infect for each poison counter your opponents have."
+1 more matching line
Pestilent Syphoner82%
$0.32↓#6608↓0.20↓3.7 years↓
"Toxic 1"
Scourge Servant81%
$0.10↓#23622↓0.28↓15.7 years
"Infect"
Cystbearer81%
$0.22↓#17552↓0.57↓16.1 years
"Infect"
Contagious Nim81%
$0.23↓#16360↓0.32↓16.1 years
"Infect"
Blightwidow81%
$0.19↓#13627↓0.37↓15.7 years
"Infect"
Razor Swine81%
$0.15↓#18439↓0.27↓15.4 years
"Infect"
Blackcleave Goblin81%
$0.20↓#17051↓0.32↓16.1 years
"Infect"
Lost Leonin81%
$0.26↓#12570↓0.29↓15.4 years
"Infect"
Phyrexian Digester81%
$0.18↓#14524↓0.33↓15.7 years
"Infect"
Glistener Elf81%
$0.60↓#6884↓0.50↓15.4 years
"Infect"
Priests of Norn81%
$0.24↓#15280↓0.39↓15.7 years
"Infect"
Branchblight Stalker80%
$0.24↓#13387↓0.16↓3.7 years↓
"Toxic 2"
Plague Stinger80%
$0.41↓#4646↓0.61↓16.1 years
"Infect"