Siege Dragon {5}{R}{R}
Creature — Dragon
Flying
When this creature enters, destroy all Walls your opponents control.
Whenever this creature attacks, if defending player controls no Walls, it deals 2 damage to each creature without flying that player controls.
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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.
Scalding Salamander 90%
$0.28#27644
"Whenever this creature attacks, you may have it deal 1 damage to each creature without flying defending player controls."
Victory's Herald 83%
$0.32#11328
"Whenever this creature attacks, attacking creatures gain flying and lifelink until end of turn."
Thunderous Orator 82%
$0.21#19631
"Whenever this creature attacks, it gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, indestructible, lifelink, menace, and trample."
Daring Skyjek 82%
$0.03#25884
"Whenever this creature and at least two other creatures attack, this creature gains flying until end of turn."
Waterspout Warden 81%
$0.14#12767
"Whenever this creature attacks, if another creature entered the battlefield under your control this turn, this creature gains flying until end of turn."