Illvoi Infiltrator 

Creature — Jellyfish Rogue
This creature can't be blocked if you've cast two or more spells this turn.
Whenever this creature deals combat damage to a player, draw a card.
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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.
Sword Coast Serpent // Capsizing Wave 95%
$0.32#6206
"This creature can't be blocked as long as you've cast a noncreature spell this turn."
Relic Runner 94%
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"This creature can't be blocked if you've cast a historic spell this turn."
Uninvited Geist // Unimpeded Trespasser 91%
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"This creature can't be blocked."
+1 more matching line