Gleam of Battle {4}{R}{W}
Enchantment
Whenever a creature you control attacks, put a +1/+1 counter on it.
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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.
Black Panther, Claws of Bast 94%
$6.88#24846
"Whenever a creature you control attacks alone, put a +1/+1 counter on it."
Keleth, Sunmane Familiar 88%
$0.23#6635
"Whenever a commander you control attacks, put a +1/+1 counter on it."
Spider-Man Noir 87%
$0.21#9388
"Whenever a creature you control attacks alone, put a +1/+1 counter on it. Then surveil X, where X is the number of counters on it."
Auron, Venerated Guardian 83%
$0.28#5563
"Whenever this card attacks, put a +1/+1 counter on it. When you do, exile target creature defending player controls with power less than this card's power until this card leaves the battlefield."
Thundering Raiju 81%
$0.54#4014
"Whenever this creature attacks, put a +1/+1 counter on target creature you control. Then this creature deals X damage to each opponent, where X is the number of modified creatures you control other than this creature."