Bloated Contaminator 
Creature — Phyrexian Beast
$3.23 #2623 0.65 3.7 years
Trample
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
Whenever this creature deals combat damage to a player, 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 Bloated Contaminator 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.
Tainted Observer96%
$0.27↓#7212↓0.39↓3.7 years
"Toxic 1"
Thrummingbird94%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Contaminant Grafter92%
$11.77↑#4067↓0.643.7 years
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
+1 more matching line
Blightbelly Rat91%
$0.26↓#27970.31↓3.7 years
"Toxic 1"
Ichorspit Basilisk90%
$0.26↓#8276↓0.28↓3.7 years
"Toxic 1"
Jawbone Duelist90%
$0.29↓#10081↓0.00↓3.7 years
"Toxic 1"
Bilious Skulldweller90%
$0.35↓#4562↓0.09↓3.7 years
"Toxic 1"
Pestilent Syphoner89%
$0.32↓#6608↓0.20↓3.7 years
"Toxic 1"
Guildpact Informant88%
$0.51↓#8791↓0.00↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition88%
$0.19↓#1813↑0.17↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Branchblight Stalker88%
$0.24↓#13387↓0.16↓3.7 years
"Toxic 2"
Sheoldred's Headcleaver88%
$0.16↓#14753↓0.41↓3.7 years
"Toxic 2"
Patrolling Peacemaker86%
$1.00↓#2022↑0.40↓1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Urban Daggertooth86%
$0.24↓#10629↓0.22↓5.3 years↑
"Whenever this creature is dealt damage, proliferate."
Tyrranax Atrocity86%
$0.27↓#11863↓0.743.7 years
"Toxic 3"
Vexing Radgull85%
$0.90↓#4810↓0.45↓2.6 years↓
"Whenever this creature deals combat damage to a player, that player gets two rad counters if they don't have any rad counters. Otherwise, proliferate."
Park Heights Maverick84%
$0.44↓#11749↓0.06↓4.5 years
"Whenever this creature deals combat damage to a player or dies, proliferate."
Crawling Chorus84%
$0.32↓#6528↓0.29↓3.7 years
"Toxic 1"
Stinging Hivemaster84%
$0.17↓#15981↓0.06↓3.7 years
"Toxic 1"
Myr Convert83%
$0.24↓#24760.18↓3.7 years
"Toxic 1"