Balefire Dragon {5}{R}{R}
Creature — Dragon
Flying
Whenever this creature deals combat damage to a player, it deals that much 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.
Shockmaw Dragon 94%
$0.16#21409
"Whenever this creature deals combat damage to a player, it deals 1 damage to each creature that player controls."
Marisi, Breaker of the Coil 89%
#4587
"Whenever a creature you control deals combat damage to a player, goad each creature that player controls."
Komainu Battle Armor 88%
$4.54#3401
"Whenever this creature or equipped creature deals combat damage to a player, goad each creature that player controls."
Siege Behemoth 87%
$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."
Hydra Omnivore 84%
$0.54#3943
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Grenzo's Ruffians 84%
$0.21#20720
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Tomb Blade 83%
$0.36#16333
"Whenever this creature deals combat damage to a player, that player loses life equal to the number of creatures they control unless they sacrifice a creature of their choice."
Striding Shotcaller // Run the Play 82%
$0.23#12973
"Whenever one or more creatures you control deal combat damage to a player, this creature becomes prepared."
Canal Courier 82%
$0.14#23657
"Whenever this creature and another creature attack different players, this creature can't be blocked this combat."