Bloated Contaminator 
Creature — Phyrexian Beast
$3.28 #2593 0.68 3.6 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%
$0.22↓#7047↓0.47↓3.6 years
"Toxic 1"
Contaminant Grafter93%
$13.98↑#3987↓0.45↓3.6 years
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
+1 more matching line
Thrummingbird92%
$0.25↓#845↑0.22↓15.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Blightbelly Rat90%
$0.24↓#27850.29↓3.6 years
"Toxic 1"
Bilious Skulldweller90%
$0.39↓#4526↓0.20↓3.6 years
"Toxic 1"
Jawbone Duelist90%
$0.29↓#9922↓0.15↓3.6 years
"Toxic 1"
Ichorspit Basilisk90%
$0.30↓#8142↓0.57↓3.6 years
"Toxic 1"
Grateful Apparition89%
$0.18↓#1836↑0.18↓7.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant89%
$0.54↓#8851↓0.52↓7.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Pestilent Syphoner88%
$0.29↓#6479↓0.50↓3.6 years
"Toxic 1"
Branchblight Stalker88%
$0.22↓#13163↓0.53↓3.6 years
"Toxic 2"
Urban Daggertooth87%
$0.26↓#10409↓0.07↓5.2 years↑
"Whenever this creature is dealt damage, proliferate."
Sheoldred's Headcleaver87%
$0.24↓#14535↓0.39↓3.6 years
"Toxic 2"
Tyrranax Atrocity86%
$0.23↓#11641↓0.33↓3.6 years
"Toxic 3"
Vexing Radgull86%
$1.39↓#4734↓0.21↓2.5 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."
Patrolling Peacemaker86%
$0.63↓#21490.45↓1.1 years↓
"Whenever an opponent commits a crime, proliferate."
Park Heights Maverick85%
$0.40↓#11435↓0.00↓4.4 years
"Whenever this creature deals combat damage to a player or dies, proliferate."
Crawling Chorus84%
$0.29↓#6383↓0.09↓3.6 years
"Toxic 1"
Stinging Hivemaster84%
$0.17↓#15784↓0.24↓3.6 years
"Toxic 1"
Myr Convert82%
$0.24↓#24550.26↓3.6 years
"Toxic 1"