Broodbirth Viper 
Creature — Snake
$0.37 #13288 0.00 10.9 years
Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
Whenever this creature deals combat damage to a player, you may draw a card.
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Cards similar to Broodbirth Viper 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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+1 more matching line
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"Whenever this creature deals combat damage to a player, draw a card."
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"Whenever this creature deals combat damage to a player, draw a card."
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"Whenever this creature deals combat damage to a player, draw a card."
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"Whenever this creature deals combat damage to a player, draw a card."
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"Whenever this creature deals combat damage to a player, draw a card."