Thrummingbird 
Creature — Phyrexian Bird Horror
$0.25 #845 0.22 15.9 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.
Grateful Apparition94%
$0.18↓#1836↓0.187.3 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant94%
$0.54↑#8851↓0.52↑7.3 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Vexing Radgull92%
$1.39↑#4734↓0.212.5 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."
Bloated Contaminator92%
$3.28↑#2593↓0.68↑3.6 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Atraxa, Praetors' Voice88%
$24.32↑#2475↓1.72↑9.8 years↓
"At the beginning of your end step, proliferate."
Patrolling Peacemaker86%
$0.63↑#2149↓0.45↑1.1 years↓
"Whenever an opponent commits a crime, proliferate."
Tidus, Yuna's Guardian84%
$0.43↑#3808↓0.45↑1.2 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."
Park Heights Maverick82%
$0.40↑#11435↓0.00↓4.4 years↓
"Whenever this creature deals combat damage to a player or dies, proliferate."
Contaminant Grafter82%
$13.98↑#3987↓0.45↑3.6 years↓
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Urban Daggertooth82%
$0.26↑#10409↓0.07↓5.2 years↓
"Whenever this creature is dealt damage, proliferate."
Soul Seizer // Ghastly Haunting78%
$0.12↓#24083↓0.00↓14.6 years↓
"Flying"
Lightning Reaver78%
$0.58↑#20342↓0.71↑17.3 years↑
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Eye Collector76%
$0.16↓#10324↓0.06↓6.9 years↓
"Flying"
Kelinore Bat74%
$0.09↓#28728↓0.00↓17.1 years↑
"Flying"
Living Tempest74%
$0.08↓#29974↓0.43↑5.9 years↓
"Flying"
Scion of Ugin74%
$0.10↓#23935↓0.40↑11.4 years↓
"Flying"
Millennial Gargoyle74%
$0.09↓#29272↓0.00↓13.6 years↓
"Flying"
Enforcer Griffin74%
$0.07↓#27521↓0.00↓7.3 years↓
"Flying"
Colorful Feiyi Sparrow74%
$0.24↓#27825↓0.278.2 years↓
"Flying"
Tormented Angel74%
$0.14↓#28488↓0.00↓27.2 years↑
"Flying"