Guildpact Informant 
Creature — Faerie Rogue
$0.51 #8791 0.00 7.5 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%
$0.19↓#1813↑0.17↑7.5 years
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Thrummingbird95%
$0.25↓#829↑0.30↑16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Bloated Contaminator88%
$3.23↑#2623↑0.65↑3.7 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Vexing Radgull88%
$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."
Atraxa, Praetors' Voice83%
$26.03↑#2362↑1.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Skyship Plunderer82%
$0.16↓#16788↓0.009.7 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."
Park Heights Maverick79%
$0.44↓#11749↓0.064.5 years↓
"Whenever this creature deals combat damage to a player or dies, proliferate."
Patrolling Peacemaker78%
$1.00↑#2022↑0.40↑1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Contaminant Grafter77%
$11.77↑#4067↑0.64↑3.7 years↓
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Urban Daggertooth77%
$0.24↓#10629↓0.22↑5.3 years↓
"Whenever this creature is dealt damage, proliferate."
Emissary of Despair76%
$0.13↓#21286↓0.26↑22.7 years↑
"Flying"
Shockmaw Dragon76%
$0.21↓#22178↓0.12↑11.7 years↑
"Flying"
Fighting Drake76%
$0.10↓#32007↓0.0029.0 years↑
"Flying"
Vassal Soul76%
$0.08↓#30769↓0.0014.0 years↑
"Flying"
Air Elemental76%
$0.02↓#24432↓0.27↑33.2 years↑
"Flying"
Mahamoti Djinn76%
$0.09↓#25646↓0.0033.2 years↑
"Flying"
Bog Imp76%
$0.06↓#27311↓0.0632.2 years↑
"Flying"
Cloud Manta76%
$0.02↓#27920↓0.0011.0 years↑
"Flying"
Spotted Griffin76%
$0.17↓#29989↓0.0029.5 years↑
"Flying"
Territorial Roc76%
$0.02↓#28691↓0.0011.6 years↑
"Flying"