Guildpact Informant 

Creature — Faerie Rogue
$0.54 #8851 0.52 7.3 years
Flying
Whenever this creature deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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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.
Grateful Apparition100%
$0.18↓#1836↑0.18↓7.3 years
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Thrummingbird94%
$0.25↓#845↑0.22↓15.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
+1 more matching line
Bloated Contaminator89%
$3.28↑#2593↑0.68↑3.6 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Vexing Radgull89%
$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."
Atraxa, Praetors' Voice84%
$24.32↑#2475↑1.72↑9.8 years↑
"At the beginning of your end step, proliferate."
Park Heights Maverick80%
$0.40↓#11435↓0.00↓4.4 years↓
"Whenever this creature deals combat damage to a player or dies, proliferate."
Urban Daggertooth78%
$0.26↓#104090.07↓5.2 years↓
"Whenever this creature is dealt damage, proliferate."
Contaminant Grafter78%
$13.98↑#3987↑0.453.6 years↓
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Patrolling Peacemaker77%
$0.63↑#2149↑0.451.1 years↓
"Whenever an opponent commits a crime, proliferate."
Tidus, Yuna's Guardian76%
$0.43↓#3808↑0.451.2 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."