In Residence 


Enchantment
When this enchantment enters, search your library for a legendary creature card with mana value X or less, exile it, then shuffle.
At the beginning of your first main phase, you may introduce the exiled card using an introduction you haven't used this game. If you do, put that card onto the battlefield. It gains haste. Exile that creature at the beginning of the next end step.
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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.