Star Compass {2}
Artifact
This artifact enters tapped.
{T}: Add one mana of any color that a basic land you control could produce.
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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.
Harvester Druid 97%
$0.24#20024
"{T}: Add one mana of any color that a land you control could produce."
Sylvok Explorer 92%
$0.33#22488
"{T}: Add one mana of any color that a land an opponent controls could produce."
Fellwar Stone 92%
$0.71#17
"{T}: Add one mana of any color that a land an opponent controls could produce."
Quirion Explorer 92%
$0.28#18317
"{T}: Add one mana of any color that a land an opponent controls could produce."
Exotic Orchard 92%
$0.17#9
"{T}: Add one mana of any color that a land an opponent controls could produce."
Cactus Preserve 83%
$5.15#3709
"{T}: Add one mana of any type that a land you control could produce."
Naga Vitalist 83%
$0.17#13439
"{T}: Add one mana of any type that a land you control could produce."
Reflecting Pool 83%
$14.78#174
"{T}: Add one mana of any type that a land you control could produce."