Mirrorshell Crab 


Artifact Creature — Crab
Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)
Channel — {2}{U}, Discard this card: Counter target spell or ability unless its controller pays {3}.
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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.
Ghost-Lit Warder 87%
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"{3}{U}, Discard this card: Counter target spell unless its controller pays {4}."
Hisoka, Minamo Sensei 84%
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"{2}{U}, Discard a card: Counter target spell if it has the same mana value as the discarded card."