Black Dragon Gate
Land — Gate
This land enters tapped.
As this land enters, choose a color other than black.
{T}: Add {B} or one mana of the chosen color.
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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.
Citadel Gate 96%
$1.90#2905
"As this land enters, choose a color other than white."
+2 more matching lines
Sea Gate 95%
$1.64#2435
"As this land enters, choose a color other than blue."
+2 more matching lines
Cliffgate 92%
$0.41#2904
"As this land enters, choose a color other than red."
+2 more matching lines
Manor Gate 91%
$0.84#2333
"As this land enters, choose a color other than green."
+2 more matching lines
Temple of the Dragon Queen 88%
$0.31#2509
"As this land enters, choose a color."
+1 more matching line