Secluded Glen
Land
As this land enters, you may reveal a Faerie card from your hand. If you don't, this land enters tapped.
{T}: Add {U} or {B}.
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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.
Gilt-Leaf Palace 83%
$10.39#5017
"As this land enters, you may reveal an Elf card from your hand. If you don't, this land enters tapped."
+1 more matching line
Hidden Lair 98%
$3.41#12985
"{T}: Add {U} or {B}. Activate only if this land entered this turn or if you control a basic land."