Frostboil Snarl
Land
As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped.
{T}: Add {U} 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.
Furycalm Snarl 90%
$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
Game Trail 88%
$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
Vineglimmer Snarl 84%
$0.23#534
"As this land enters, you may reveal a Forest or Island card from your hand. If you don't, this land enters tapped."
+1 more matching line
Port Town 84%
$0.24#341
"As this land enters, you may reveal a Plains or Island card from your hand. If you don't, this land enters tapped."
+1 more matching line
Foreboding Ruins 82%
#328
"As this land enters, you may reveal a Swamp 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
The Emperor of Palamecia // The Lord Master of Hell 99%
$0.23#4997
"{T}: Add {U} or {R}. Spend this mana only to cast a noncreature spell."