Thundering Raiju {2}{R}{R}
Creature — Spirit
Haste
Whenever this creature attacks, put a +1/+1 counter on target creature you control. Then this creature deals X damage to each opponent, where X is the number of modified creatures you control other than this creature. (Equipment, Auras you control, and counters are modifications.)
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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.
Expanding Ooze 85%
$0.16#17825
"Whenever this creature attacks, put a +1/+1 counter on target modified creature you control."
Erithizon 85%
$0.39#31125
"Whenever this creature attacks, put a +1/+1 counter on target creature of defending player's choice."
Gleam of Battle 81%
$0.14#13144
"Whenever a creature you control attacks, put a +1/+1 counter on it."