Choked Estuary
Land
As this land enters, you may reveal an Island or Swamp 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.
Shineshadow Snarl 90%
$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
Necroblossom Snarl 89%
$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
Port Town 85%
$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
Isolated Chapel 81%
$0.33#93
"This land enters tapped unless you control a Plains or a Swamp."
+1 more matching line
Foreboding Ruins 81%
#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
Frostboil Snarl 81%
$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
Vineglimmer Snarl 80%
$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