Shineshadow Snarl
Land
As this land enters, you may reveal a Plains or Swamp card from your hand. If you don't, this land enters tapped.
{T}: Add {W} 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.
Choked Estuary 90%
#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
Port Town 88%
$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
Necroblossom Snarl 88%
$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
Isolated Chapel 86%
$0.33#93
"This land enters tapped unless you control a Plains or a Swamp."
+1 more matching line
Furycalm Snarl 80%
$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
Foreboding Ruins 80%
#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