Marauding Mako {R}
Creature — Shark Pirate
Whenever you discard one or more cards, put that many +1/+1 counters on this creature.
Cycling {2} ({2}, Discard this card: 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.
Scrounging Skyray 100%
$0.26#7469
"Whenever you discard one or more cards, put that many +1/+1 counters on this creature."
+1 more matching line
Surly Badgersaur 86%
$14.65#3114
"Whenever you discard a creature card, put a +1/+1 counter on this creature."