Mind Maggots 
Creature — Insect
$0.25 #28494 0.00 28.3 years
When this creature enters, discard any number of creature cards. For each card discarded this way, put two +1/+1 counters on this creature.
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Cards similar to Mind Maggots 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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"Discard a creature card: Put a +1/+1 counter on this creature."
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"
, Discard a creature card: Put a +1/+1 counter on this creature."
, Discard a creature card: Put a +1/+1 counter on this creature."
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"When this creature enters, sacrifice it unless you discard a creature card."
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"When this creature enters, exile it unless you discard a creature card."
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"When this creature enters, you may sacrifice a creature or discard a creature card. If you do, draw a card."