Dreadwing Scavenger 
Creature — Nightmare Bird
$0.21 #11074 0.12 1.8 years
Flying
Whenever this creature enters or attacks, draw a card, then discard a card.
Threshold — This creature gets +1/+1 and has deathtouch as long as there are seven or more cards in your graveyard.
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Cards similar to Dreadwing Scavenger 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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"Whenever this card enters or attacks, draw a card, then discard a card."
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"Whenever this card enters or attacks, he connives."
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$0.07↓#26718↓0.00↓24.9 years↑
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"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
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$0.12↓#30880↓0.00↓24.9 years↑
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
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$0.22↑#21243↓0.57↑6.9 years↑
"Whenever this creature enters or attacks, you may discard a card. If you do, draw a card."
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$0.15↓#23930↓0.124.9 years↑
"Whenever this creature attacks, draw a card, then discard a card."
+1 more matching line
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"Flying"
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"Whenever you attack, draw a card, then discard a card."