Sinister Cryologist 

Creature — Jellyfish Wizard
$0.08 #23773 0.05 1.1 years
When this creature enters, target creature an opponent controls gets -3/-0 until end of turn.
Warp
(You may cast this card from your hand for its warp cost. Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.)
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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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