Foreboding Ruins
Land
As this land enters, you may reveal a Swamp or Mountain card from your hand. If you don't, this land enters tapped.
{T}: Add {B} or {R}.
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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.
Necroblossom Snarl 86%
$0.37#523
"As this land enters, you may reveal a Swamp or Forest card from your hand. If you don't, this land enters tapped."
+1 more matching line
Furycalm Snarl 83%
$0.24#347
"As this land enters, you may reveal a Mountain or Plains card from your hand. If you don't, this land enters tapped."
+1 more matching line
Dragonskull Summit 82%
$0.33#86
"This land enters tapped unless you control a Swamp or a Mountain."
+1 more matching line
Dalkovan Encampment 82%
$0.50#3597
"This land enters tapped unless you control a Swamp or a Mountain."
Frostboil Snarl 82%
$0.27#335
"As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped."
+1 more matching line
Choked Estuary 81%
#290
"As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped."
+1 more matching line
Game Trail 81%
$0.29#375
"As this land enters, you may reveal a Mountain or Forest card from your hand. If you don't, this land enters tapped."
+1 more matching line
Shineshadow Snarl 80%
$0.28#416
"As this land enters, you may reveal a Plains or Swamp card from your hand. If you don't, this land enters tapped."
+1 more matching line