Cosi's Trickster 
Creature — Merfolk Wizard
$0.49 #15534 0.06 17.0 years
Whenever an opponent shuffles their library, you may put a +1/+1 counter on this creature.
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Cards similar to Cosi's Trickster 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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"Whenever an opponent searches their library, put a +1/+1 counter on this card and draw a card."