Core Prowler 
Artifact Creature — Phyrexian Horror
$0.64 #7768 1.06 15.7 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 dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards similar to Core Prowler 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 Vatmother98%
$0.41↓#13699↓0.32↓15.7 years
"Infect"
Scourge Servant98%
$0.10↓#23622↓0.28↓15.7 years
"Infect"
Cystbearer98%
$0.22↓#17552↓0.57↓16.1 years
"Infect"
Contagious Nim98%
$0.23↓#16360↓0.32↓16.1 years
"Infect"
Blightwidow98%
$0.19↓#13627↓0.37↓15.7 years
"Infect"
Ichor Rats98%
$3.85↑#3296↑0.86↓16.1 years
"Infect"
Razor Swine98%
$0.15↓#18439↓0.27↓15.4 years
"Infect"
Blackcleave Goblin98%
$0.20↓#17051↓0.32↓16.1 years
"Infect"
Lost Leonin98%
$0.26↓#12570↓0.29↓15.4 years
"Infect"
Phyrexian Digester98%
$0.18↓#14524↓0.33↓15.7 years
"Infect"
Glistener Elf98%
$0.60↓#68840.50↓15.4 years
"Infect"
Priests of Norn98%
$0.24↓#15280↓0.39↓15.7 years
"Infect"
Plague Stinger98%
$0.41↓#4646↑0.61↓16.1 years
"Infect"
Shriek Raptor98%
$0.17↓#21277↓0.50↓15.4 years
"Infect"
Tine Shrike98%
$0.18↓#18251↓0.76↓15.7 years
"Infect"
Flensermite98%
$0.27↓#12319↓0.19↓15.7 years
"Infect"
Viridian Corrupter96%
$0.35↓#62970.28↓15.7 years
"Infect"
Blight Mamba96%
$0.26↓#80160.43↓16.1 years
"Infect"
Plague Myr96%
$2.60↑#2144↑0.23↓15.7 years
"Infect"
Blighted Agent96%
$1.45↑#3126↑0.94↓15.4 years
"Infect"