Grateful Apparition 

Creature — Spirit
$0.19 #1813 0.17 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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Cards similar to Grateful Apparition 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.
Guildpact Informant100%
$0.51↑#8791↓0.00↓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↓0.00↓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."
Park Heights Maverick79%
$0.44↑#11749↓0.06↓4.5 years↓
"Whenever this creature deals combat damage to a player or dies, proliferate."
Patrolling Peacemaker78%
$1.00↑#20220.40↑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↓0.225.3 years↓
"Whenever this creature is dealt damage, proliferate."