Mistcaller 
Creature — Merfolk Wizard
$0.40 #15094 0.31 8.1 years
Sacrifice this creature: Until end of turn, if a nontoken creature would enter and it wasn't cast, exile it instead.
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Cards similar to Mistcaller 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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"If a nontoken creature would enter and it wasn't cast, exile it instead."
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"Until end of turn, if one or more creatures would enter from exile or after being cast from exile, their owners shuffle them into their libraries instead."