Atraxa, Praetors' Voice 
Legendary Creature — Phyrexian Angel Horror
$26.03 #2362 1.77 9.9 years
Flying, vigilance, deathtouch, lifelink
At the beginning of your end step, 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 Atraxa, Praetors' Voice 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.
Thrummingbird88%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Inexorable Tide87%
$0.91↓#996↑0.58↓16.1 years↑
"Whenever you cast a spell, proliferate."
Metastatic Evangel86%
$0.37↓#1514↑0.30↓2.3 years↓
"Whenever another nontoken creature you control enters, proliferate."
Merfolk Skydiver84%
$0.26↓#6733↓0.06↓7.5 years↓
"
: Proliferate."
: Proliferate."
Aerial Responder83%
$0.12↓#8768↓0.00↓10.1 years
"Flying, vigilance, lifelink"
Guildpact Informant83%
$0.51↓#8791↓0.00↓7.5 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition83%
$0.19↓#1813↑0.17↓7.5 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Sunblade Angel82%
$0.20↓#14597↓0.00↓7.5 years↓
"Flying, first strike, vigilance, lifelink"
Tainted Observer82%
$0.27↓#7212↓0.39↓3.7 years↓
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Karn's Bastion82%
$2.77↓#206↑0.23↓7.5 years↓
"
, 
: Proliferate."
, : Proliferate."
Vexing Radgull82%
$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."
Urban Daggertooth80%
$0.24↓#10629↓0.22↓5.3 years↓
"Whenever this creature is dealt damage, proliferate."
Patrolling Peacemaker80%
$1.00↓#20220.40↓1.2 years↓
"Whenever an opponent commits a crime, proliferate."
Gifted Aetherborn80%
$0.34↓#4778↓0.05↓9.7 years
"Deathtouch, lifelink"
Bloated Contaminator80%
$3.23↓#26230.65↓3.7 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Seraph of Dawn80%
$0.13↓#14625↓0.00↓14.5 years↑
"Flying, lifelink"
Healer's Flock80%
$0.25↓#17726↓0.07↓5.3 years↓
"Flying, lifelink"
Insatiable Harpy80%
$0.06↓#27403↓0.11↓13.1 years↑
"Flying, lifelink"
Gisela, the Broken Blade80%
$22.26↓#25420.32↓10.2 years
"Flying, first strike, lifelink"
Surge Conductor79%
$0.33↓#25950.45↓1.2 years↓
"Whenever another nontoken artifact you control enters, proliferate."