Citadel Gate
Land — Gate
This land enters tapped.
As this land enters, choose a color other than white.
{T}: Add {W} 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.
Thriving Heath 100%
$0.22#1080
"{T}: Add {W} or one mana of the chosen color."
+1 more matching line
Black Dragon Gate 96%
$0.51#2434
"As this land enters, choose a color other than black."
+2 more matching lines
Sea Gate 93%
$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