Kediss, Emberclaw Familiar {1}{R}
Legendary Creature — Elemental Lizard
Whenever a commander you control deals combat damage to an opponent, it deals that much damage to each other opponent.
Partner (You can have two commanders if both have partner.)
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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.
Amarant Coral 87%
$3.77#15826
"Whenever this card deals combat damage to an opponent, it deals that much damage to each other opponent."
Vincent, Vengeful Atoner 82%
$0.32#4321
"Whenever this card deals combat damage to an opponent, it deals that much damage to each other opponent if this card's power is 7 or greater."
Hydra Omnivore 81%
$0.54#3943
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Grenzo's Ruffians 81%
$0.21#20720
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Saskia the Unyielding 80%
#10445
"Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player."