Kiora's Dambreaker 
Creature — Leviathan
$0.10 #17821 0.00 7.5 years
When this creature enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Cards similar to Kiora's Dambreaker 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.
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"When this creature enters, proliferate."
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"When this creature enters, proliferate."
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"When this creature enters, you may tap it. If you do, proliferate."
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"When this creature enters, put a +1/+1 counter on another target creature you control."