Thrummingbird 
Creature — Phyrexian Bird Horror
$0.25 #829 0.30 16.1 years
Flying
Whenever this creature deals combat damage to a player, 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 Thrummingbird 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 Informant95%
$0.51↑#8791↓0.00↓7.5 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition95%
$0.19↓#1813↓0.17↓7.5 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Bloated Contaminator94%
$3.23↑#2623↓0.65↑3.7 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Vexing Radgull93%
$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' Voice88%
$26.03↑#2362↓1.77↑9.9 years↓
"At the beginning of your end step, proliferate."
Skyship Plunderer86%
$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 Maverick84%
$0.44↑#11749↓0.06↓4.5 years↓
"Whenever this creature deals combat damage to a player or dies, proliferate."
Contaminant Grafter82%
$11.77↑#4067↓0.64↑3.7 years↓
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Patrolling Peacemaker82%
$1.00↑#2022↓0.40↑1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Urban Daggertooth82%
$0.24↓#10629↓0.225.3 years↓
"Whenever this creature is dealt damage, proliferate."
Tidus, Yuna's Guardian81%
$0.43↑#3699↓0.68↑1.4 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."
Emissary of Despair76%
$0.13↓#21286↓0.2622.7 years↑
"Flying"
Shockmaw Dragon76%
$0.21↓#22178↓0.12↓11.7 years↓
"Flying"
Fighting Drake76%
$0.10↓#32007↓0.00↓29.0 years↑
"Flying"
Vassal Soul76%
$0.08↓#30769↓0.00↓14.0 years↓
"Flying"
Air Elemental76%
$0.02↓#24432↓0.2733.2 years↑
"Flying"
Mahamoti Djinn76%
$0.09↓#25646↓0.00↓33.2 years↑
"Flying"
Bog Imp76%
$0.06↓#27311↓0.06↓32.2 years↑
"Flying"
Cloud Manta76%
$0.02↓#27920↓0.00↓11.0 years↓
"Flying"
Spotted Griffin76%
$0.17↓#29989↓0.00↓29.5 years↑
"Flying"