Squall, Gunblade Duelist {R}{W}{B}
Legendary Creature — Human Mercenary
First strike
As Squall enters, choose a number.
Whenever one or more creatures attack one of your opponents, if any of those creatures have power or toughness equal to the chosen number, Squall deals damage equal to its power to defending player.
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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.
Path of Bravery 87%
$0.30#12342
"Whenever one or more creatures you control attack, you gain life equal to the number of attacking creatures."
Within Range 86%
$0.49#4701
"Whenever you attack, each opponent loses life equal to the number of creatures attacking them."
Lightmine Field 84%
$5.79#11170
"Whenever one or more creatures attack, this enchantment deals damage to each of those creatures equal to the number of attacking creatures."
Barret Wallace 81%
$0.13#10380
"Whenever this card attacks, it deals damage equal to the number of equipped creatures you control to defending player."