Oracle's Vault {4}
Artifact
{2}, {T}: Exile the top card of your library. Until end of turn, you may play that card. Put a brick counter on this artifact.
{T}: Exile the top card of your library. Until end of turn, you may play that card without paying its mana cost. Activate only if there are three or more brick counters on this artifact.
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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.
Kianne, Dean of Substance // Imbraham, Dean of Theory 99%
$0.16#22584
"{T}: Exile the top card of your library. If it's a land card, put it into your hand. Otherwise, put a study counter on it."
Yasmin Khan 98%
#15113
"{T}: Exile the top card of your library. Until your next end step, you may play it."
Elkin Bottle 88%
#30175
"{3}, {T}: Exile the top card of your library. Until the beginning of your next upkeep, you may play that card."