Terisian Mindbreaker {7}
Artifact Creature — Juggernaut
Whenever this creature attacks, defending player mills half their library, rounded up.
Unearth {1}{U}{U}{U} ({1}{U}{U}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
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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.
Fleet Swallower 82%
$1.25#4912
"Whenever this creature attacks, target player mills half their library, rounded up."
Xantid Swarm 81%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Innocuous Researcher 81%
$0.26#12932
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card."