Echo Inspector 

Creature — Bird Rogue
$0.08 #23729 0.15 4.4 years
Flying
When this creature enters, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)
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Cards similar to Echo Inspector 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, draw a card, then discard a card."