Flood Plain
Land
This land enters tapped.
{T}, Sacrifice this land: Search your library for a Plains or Island card, put it onto the battlefield, then shuffle.
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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.
Bad River 83%
$1.34#6651
"{T}, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle."
+1 more matching line