Vexing Radgull 
Creature — Bird Mutant
$0.90 #4810 0.45 2.6 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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Cards similar to Vexing Radgull 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.
Thrummingbird93%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Guildpact Informant88%
$0.51↓#8791↓0.00↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition88%
$0.19↓#1813↑0.17↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Bloated Contaminator85%
$3.23↑#2623↑0.65↑3.7 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Skyship Plunderer84%
$0.16↓#16788↓0.00↓9.7 years↑
"Whenever this creature deals combat damage to a player, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind."
Glowing One82%
$1.49↑#46240.56↑2.6 years
"Whenever this creature deals combat damage to a player, they get four rad counters."
Atraxa, Praetors' Voice82%
$26.03↑#2362↑1.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Shriekgeist81%
$0.10↓#23923↓0.00↓14.7 years↑
"Whenever this creature deals combat damage to a player, that player mills two cards."
Infesting Radroach78%
$1.34↑#50990.442.6 years
"Whenever this creature deals combat damage to a player, they get that many rad counters."
Park Heights Maverick78%
$0.44↓#11749↓0.06↓4.5 years↑
"Whenever this creature deals combat damage to a player or dies, proliferate."
Necromaster Dragon77%
$0.29↓#19390↓0.24↓11.6 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."
Urban Daggertooth76%
$0.24↓#10629↓0.22↓5.3 years↑
"Whenever this creature is dealt damage, proliferate."
Tidus, Yuna's Guardian76%
$0.43↓#3699↑0.68↑1.4 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."
Patrolling Peacemaker76%
$1.00↑#2022↑0.401.2 years↓
"Whenever an opponent commits a crime, proliferate."
Contaminant Grafter75%
$11.77↑#40670.64↑3.7 years↑
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Balshan Beguiler75%
$0.15↓#30600↓0.28↓25.1 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."
Scalpelexis75%
$0.27↓#28270↓0.3624.4 years↑
"Flying"
Lightning Reaver74%
$0.57↓#20758↓0.28↓17.5 years↑
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Fighting Drake74%
$0.10↓#32007↓0.00↓29.0 years↑
"Flying"
Vassal Soul74%
$0.08↓#30769↓0.00↓14.0 years↑
"Flying"