River Darter 
Creature — Merfolk Warrior
$0.12 #31043 0.00 8.8 years
This creature can't be blocked by Dinosaurs.
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Cards similar to River Darter 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.
Dinosaur Hunter80%
$0.07↓#307890.14↑8.8 years
"Whenever this creature deals damage to a Dinosaur, destroy that creature."