Mirri the Cursed 
Legendary Creature — Vampire Cat
$0.57 #9790 0.00 19.6 years
Flying, first strike, haste
Whenever Mirri deals combat damage to a creature, put a +1/+1 counter on Mirri.
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Cards similar to Mirri the Cursed 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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. If you do, put six +1/+1 counters on this card."
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"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
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+1 more matching line
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"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
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