Atraxa, Praetors' Voice 
Legendary Creature — Phyrexian Angel Horror
$24.32 #2475 1.72 9.8 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↓#845↑0.22↓15.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Inexorable Tide88%
$1.13↓#1036↑0.66↓15.9 years↑
"Whenever you cast a spell, proliferate."
Metastatic Evangel86%
$0.37↓#1514↑0.33↓2.2 years↓
"Whenever another nontoken creature you control enters, proliferate."
Tainted Observer84%
$0.22↓#7047↓0.47↓3.6 years↓
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Merfolk Skydiver84%
$0.24↓#6599↓0.15↓7.3 years↓
"
: Proliferate."
: Proliferate."
Grateful Apparition84%
$0.18↓#1836↑0.18↓7.3 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant84%
$0.54↓#8851↓0.52↓7.3 years↓
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Karn's Bastion83%
$2.48↓#208↑0.23↓7.3 years↓
"
, 
: Proliferate."
, : Proliferate."
Aerial Responder82%
$0.10↓#8743↓0.25↓9.9 years
"Flying, vigilance, lifelink"
Sunblade Angel82%
$0.13↓#14395↓0.04↓7.3 years↓
"Flying, first strike, vigilance, lifelink"
Vexing Radgull82%
$1.39↓#4734↓0.21↓2.5 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."
Urban Daggertooth81%
$0.26↓#10409↓0.07↓5.2 years↓
"Whenever this creature is dealt damage, proliferate."
Bloated Contaminator80%
$3.28↓#25930.68↓3.6 years↓
"Whenever this creature deals combat damage to a player, proliferate."
Patrolling Peacemaker80%
$0.63↓#21490.45↓1.1 years↓
"Whenever an opponent commits a crime, proliferate."
Flux Channeler80%
$2.28↓#1303↑0.34↓7.3 years↓
"Whenever you cast a noncreature spell, proliferate."
Gifted Aetherborn79%
$0.36↓#4724↓0.19↓9.6 years
"Deathtouch, lifelink"
Healer's Flock79%
$0.22↓#17430↓0.53↓5.2 years↓
"Flying, lifelink"
Seraph of Dawn79%
$0.14↓#14454↓0.00↓14.3 years↑
"Flying, lifelink"
Insatiable Harpy79%
$0.04↓#27166↓0.47↓12.9 years↑
"Flying, lifelink"
Gisela, the Broken Blade79%
$21.07↓#25760.32↓10.1 years
"Flying, first strike, lifelink"