Etrata, the Silencer {2}{U}{B}
Legendary Creature — Vampire Assassin
Etrata can't be blocked.
Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card. That player loses the game if they own three or more exiled cards with hit counters on them. Etrata's owner shuffles Etrata into their library.
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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.
Ant-Man, Elusive Avenger 88%
$1.14#16411
"this card can't be blocked by creatures with greater power."
Arvinox, the Mind Flail 86%
$0.38#4746
"this card isn't a creature unless you control three or more permanents you don't own."