Contaminant Grafter 
Creature — Phyrexian Druid
$13.98 #3987 0.45 3.6 years
Trample, toxic 1
Whenever one or more creatures you control deal combat damage to one or more players, proliferate.
Corrupted — At the beginning of your end step, if an opponent has three or more poison counters, draw a card, then you may put a land card from your hand onto the battlefield.
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Cards similar to Contaminant Grafter 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.
Bloated Contaminator93%
$3.28↓#2593↑0.68↑3.6 years
"Whenever this creature deals combat damage to a player, proliferate."
Thrummingbird82%
$0.25↓#845↑0.22↓15.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Grateful Apparition78%
$0.18↓#1836↑0.18↓7.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant78%
$0.54↓#8851↓0.527.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Patrolling Peacemaker77%
$0.63↓#2149↑0.451.1 years↓
"Whenever an opponent commits a crime, proliferate."
Park Heights Maverick76%
$0.40↓#11435↓0.00↓4.4 years
"Whenever this creature deals combat damage to a player or dies, proliferate."
Tidus, Yuna's Guardian76%
$0.43↓#38080.451.2 years↓
"Whenever one or more creatures you control with counters on them deal combat damage to a player, you may draw a card and proliferate. Do this only once each turn."
Vexing Radgull76%
$1.39↓#47340.21↓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."
Urban Daggertooth76%
$0.26↓#10409↓0.07↓5.2 years↑
"Whenever this creature is dealt damage, proliferate."
Kynaios and Tiro of Meletis74%
$2.58↓#6845↓0.05↓9.8 years↑
"At the beginning of your end step, draw a card. Each player may put a land card from their hand onto the battlefield, then each opponent who didn't draws a card."
Goliath Hatchery74%
$0.33↓#15022↓0.86↑3.6 years
"At the beginning of your upkeep, if an opponent has three or more poison counters, choose a creature you control, then draw cards equal to its total toxic value."
Atraxa, Praetors' Voice74%
$24.32↑#2475↑1.72↑9.8 years↑
"At the beginning of your end step, proliferate."
Gretchen Titchwillow73%
$0.17↓#8541↓0.32↓5.1 years↑
"
: Draw a card. You may put a land card from your hand onto the battlefield."
: Draw a card. You may put a land card from your hand onto the battlefield."
Tainted Observer73%
$0.22↓#7047↓0.473.6 years
"Whenever another creature you control enters, you may pay . If you do, proliferate."
. If you do, proliferate."
H.E.R.B.I.E. Scout Unit72%
$0.23↓#11423↓0.00↓0.2 years↓
"When this creature enters, draw a card, then you may put a land card from your hand onto the battlefield tapped."
Growth Spiral70%
$0.28↓#231↑0.16↓7.6 years↑
"Draw a card. You may put a land card from your hand onto the battlefield."
Arboreal Grazer70%
$0.29↓#2181↑0.17↓7.3 years↑
"When this creature enters, you may put a land card from your hand onto the battlefield tapped."