Arena Rector 
Creature — Human Cleric
$10.67 #8840 0.56 8.4 years
When this creature dies, you may exile it. If you do, search your library for a planeswalker card, put it onto the battlefield, then shuffle.
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Cards similar to Arena Rector 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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"When this creature dies, you may exile it. If you do, search your library for an enchantment card, put that card onto the battlefield, then shuffle."
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"When this card is put into exile from the battlefield, you may pay 
. If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle."
. If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle."
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"When this creature dies, exile it."
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"When this creature dies, exile it, then shuffle all creature cards from your graveyard into your library."