Vexing Radgull 
Creature — Bird Mutant
$1.39 #4734 0.21 2.5 years
Flying
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. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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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.
Thrummingbird92%
$0.25↓#845↑0.2215.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
+1 more matching line
Grateful Apparition89%
$0.18↓#1836↑0.187.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant89%
$0.54↓#8851↓0.52↑7.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Bloated Contaminator86%
$3.28↑#2593↑0.68↑3.6 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Eye Collector82%
$0.16↓#10324↓0.06↓6.9 years↑
"Flying"
Recon Craft Theta82%
$2.01↑#5900↓0.33↑2.5 years
"Flying"
Glowing One82%
$2.30↑#45240.54↑2.5 years
"Whenever this creature deals combat damage to a player, they get four rad counters."
Atraxa, Praetors' Voice82%
$24.32↑#2475↑1.72↑9.8 years↑
"At the beginning of your end step, proliferate."
Shriekgeist81%
$0.13↓#23593↓0.00↓14.6 years↑
"Whenever this creature deals combat damage to a player, that player mills two cards."
Park Heights Maverick78%
$0.40↓#11435↓0.00↓4.4 years↑
"Whenever this creature deals combat damage to a player or dies, proliferate."
Urban Daggertooth78%
$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"
Infesting Radroach77%
$2.20↑#50180.202.5 years
"Whenever this creature deals combat damage to a player, they get that many rad counters."
+1 more matching line
Necromaster Dragon76%
$0.31↓#18907↓0.1911.4 years↑
"Whenever this creature deals combat damage to a player, you may pay 
. If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
. If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
Tidus, Yuna's Guardian76%
$0.43↓#38080.45↑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."
Contaminant Grafter76%
$13.98↑#39870.45↑3.6 years↑
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Patrolling Peacemaker75%
$0.63↓#2149↑0.45↑1.1 years↓
"Whenever an opponent commits a crime, proliferate."
Thought Harvester75%
$0.18↓#22424↓0.2610.6 years↑
"Flying"
Balshan Beguiler74%
$0.13↓#30221↓0.07↓24.9 years↑
"Whenever this creature deals combat damage to a player, that player reveals the top two cards of their library. You choose one of those cards and put it into their graveyard."
Knacksaw Clique74%
$3.35↑#17338↓0.2018.3 years↑
"Flying"