Hidden Courtyard
Land — Cave
This land enters tapped.
{T}: Add {W}.
{4}{W}, {T}, Sacrifice this land: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)
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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.
Lupinflower Village 89%
$0.26#4577
"{1}{W}, {T}, Sacrifice this land: Look at the top six cards of your library. You may reveal a Bat, Bird, Mouse, or Rabbit card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
+1 more matching line
The Fair Basilica 88%
$0.27#6829
"{1}{W}, {T}, Sacrifice this land: Draw a card."
+2 more matching lines
Country Roads 87%
$0.31#8655
"{1}{W}, {T}, Sacrifice this land: Create a 1/1 colorless Pilot creature token with "This token saddles Mounts and crews Vehicles as though its power were 2 greater." Activate only as a sorcery."
+1 more matching line
Memorial to Glory 84%
$0.22#6765
"{3}{W}, {T}, Sacrifice this land: Create two 1/1 white Soldier creature tokens."
+2 more matching lines