Triton Fortune Hunter 

Creature — Merfolk Soldier
Heroic — Whenever you cast a spell that targets this creature, draw a card.
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Cards that do something similar 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.
Gnarlback Rhino 100%
$0.09#16604
"Whenever you cast a spell that targets this creature, draw a card."
Cactarantula 80%
$0.06#15583
"Whenever this creature becomes the target of a spell or ability an opponent controls, you may draw a card."