Shockmaw Dragon {4}{R}{R}
Creature — Dragon
Flying
Whenever this creature deals combat damage to a player, it deals 1 damage to each creature 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.
Balefire Dragon 94%
$15.16#1256
"Whenever this creature deals combat damage to a player, it deals that much damage to each creature that player controls."
Marisi, Breaker of the Coil 86%
#4587
"Whenever a creature you control deals combat damage to a player, goad each creature that player controls."
Komainu Battle Armor 84%
$4.54#3401
"Whenever this creature or equipped creature deals combat damage to a player, goad each creature that player controls."
Siege Behemoth 82%
$7.67#8600
"As long as this creature is attacking, for each creature you control, you may have that creature assign its combat damage as though it weren't blocked."
Swathcutter Giant 82%
$0.22#20727
"Whenever this creature attacks, it deals 1 damage to each creature defending player controls."