Contaminant Grafter 
Creature — Phyrexian Druid
$11.77 #4067 0.64 3.7 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 Contaminator92%
$3.23↓#2623↑0.653.7 years
"Whenever this creature deals combat damage to a player, proliferate."
+1 more matching line
Thrummingbird82%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Patrolling Peacemaker78%
$1.00↓#2022↑0.40↓1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Guildpact Informant77%
$0.51↓#8791↓0.00↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition77%
$0.19↓#1813↑0.17↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Tidus, Yuna's Guardian76%
$0.43↓#36990.681.4 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."
Park Heights Maverick76%
$0.44↓#11749↓0.06↓4.5 years
"Whenever this creature deals combat damage to a player or dies, proliferate."
Vexing Radgull75%
$0.90↓#48100.45↓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."
Urban Daggertooth75%
$0.24↓#10629↓0.22↓5.3 years↑
"Whenever this creature is dealt damage, proliferate."
Goliath Hatchery75%
$0.31↓#15301↓0.593.7 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."
Kynaios and Tiro of Meletis74%
$2.33↓#6628↓0.44↓9.9 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."
Gretchen Titchwillow74%
$0.22↓#8754↓0.07↓5.2 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."
Atraxa, Praetors' Voice73%
$26.03↑#2362↑1.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Tainted Observer72%
$0.27↓#7212↓0.39↓3.7 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%
$0.26↓#9250↓0.16↓0.3 years↓
"When this creature enters, draw a card, then you may put a land card from your hand onto the battlefield tapped."
Growth Spiral70%
$0.30↓#239↑0.15↓7.7 years↑
"Draw a card. You may put a land card from your hand onto the battlefield."
Arboreal Grazer70%
$0.26↓#2170↑0.18↓7.5 years↑
"When this creature enters, you may put a land card from your hand onto the battlefield tapped."
Skyship Plunderer70%
$0.16↓#16788↓0.00↓9.7 years↑
"Whenever this creature deals combat damage to a player, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind."
Scaled Herbalist70%
$0.28↓#8543↓0.27↓5.2 years↑
"
: You may put a land card from your hand onto the battlefield."
: You may put a land card from your hand onto the battlefield."
Llanowar Scout70%
$0.29↓#6300↓0.53↓8.5 years↑
": You may put a land card from your hand onto the battlefield."
: You may put a land card from your hand onto the battlefield."