Generous Pup {1}{W}
Creature — Dog
Vigilance
Whenever one or more +1/+1 counters are put on this creature, put a +1/+1 counter on each other creature you control. This ability triggers only once each turn.
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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.
Bellowing Aegisaur 92%
$0.30#7788
"Whenever this creature is dealt damage, put a +1/+1 counter on each other creature you control."
High Sentinels of Arashin 90%
$0.21#14978
"This creature gets +1/+1 for each other creature you control with a +1/+1 counter on it."
Renegade Krasis 90%
$0.31#14686
"Whenever this creature evolves, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it."
Thunderwolf Cavalry 88%
$0.36#15063
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on each other creature you control."
Bounding Felidar 87%
$0.18#10971
"Whenever this creature attacks while saddled, put a +1/+1 counter on each other creature you control. You gain 1 life for each of those creatures."
Avatar of the Resolute 82%
$0.30#16559
"This creature enters with a +1/+1 counter on it for each other creature you control with a +1/+1 counter on it."
Monica Rambeau // Photon, Living Light 81%
$1.74#16652
"Whenever you cast a noncreature spell, put a +1/+1 counter on each other creature you control."
Seven Dwarves 81%
$0.52#11874
"This creature gets +1/+1 for each other creature named this card you control."
Sheriff of Safe Passage 81%
$0.13#16985
"This creature enters with a +1/+1 counter on it plus an additional +1/+1 counter on it for each other creature you control."
Mirror Box 81%
$5.37#1687
"Each nontoken creature you control gets +1/+1 for each other creature you control with the same name as that creature."