Norn's Choirmaster 
Creature — Phyrexian Angel
$2.79 #3270 0.44 3.7 years
Flying, first strike
Whenever a commander you control enters or attacks, 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 Norn's Choirmaster 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 Informant84%
$0.51↓#8791↓0.00↓7.5 years↑
"Flying"
Keleth, Sunmane Familiar81%
$0.18↓#6857↓0.06↓5.9 years↑
"Whenever a commander you control attacks, put a +1/+1 counter on it."
Metastatic Evangel81%
$0.37↓#1514↑0.30↓2.3 years↓
"Whenever another nontoken creature you control enters, proliferate."
Atraxa, Praetors' Voice78%
$26.03↑#2362↑1.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Tainted Observer76%
$0.27↓#7212↓0.393.7 years
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Tome of Legends75%
$0.26↓#2204↑0.14↓7.0 years↑
"Whenever your commander enters or attacks, put a page counter on this artifact."
Agent Frank Horrigan74%
$3.33↑#35610.402.6 years↓
"Whenever this card enters or attacks, proliferate twice."
Surge Conductor74%
$0.33↓#2595↑0.451.2 years↓
"Whenever another nontoken artifact you control enters, proliferate."
Thrummingbird73%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Thunder Spirit72%
$135.29↑#30782↓0.18↓32.4 years↑
"Flying, first strike"
Battlefield Raptor72%
$0.26↓#7972↓0.00↓5.7 years↑
"Flying, first strike"
Voiceless Spirit72%
$0.08↓#28581↓0.22↓15.1 years↑
"Flying, first strike"
Sky Spirit72%
$0.16↓#28647↓0.06↓29.0 years↑
"Flying, first strike"
Steeple Roc72%
$0.03↓#30097↓0.00↓13.5 years↑
"Flying, first strike"
Plover Knights72%
$0.13↓#28675↓0.20↓19.0 years↑
"Flying, first strike"
Sabertooth Wyvern72%
$0.09↓#32130↓0.00↓28.3 years↑
"Flying, first strike"
Silverclaw Griffin72%
$0.16↓#26968↓0.00↓14.7 years↑
"Flying, first strike"
Hobgoblin Dragoon72%
$0.10↓#30199↓0.00↓18.2 years↑
"Flying, first strike"
Angel of Retribution72%
$0.23↓#27070↓0.00↓24.7 years↑
"Flying, first strike"
Ekundu Griffin72%
$0.10↓#25043↓0.00↓30.0 years↑
"Flying, first strike"