Vexing Radgull {1}{U}
Creature — Bird Mutant
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 that do something similar 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.
Infesting Radroach 92%
$2.78#4953
"Whenever this creature deals combat damage to a player, they get that many rad counters."
Glowing One 89%
$2.42#4458
"Whenever this creature deals combat damage to a player, they get four rad counters."
Screeching Scorchbeast 84%
$2.09#4085
"Whenever this creature attacks, each player gets two rad counters."