Pale Moon 
Instant
$0.47 #27922 0.72 26.7 years
Until end of turn, if a player taps a nonbasic land for mana, it produces colorless mana instead of any other type.
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Cards similar to Pale Moon 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.
Ritual of Subdual82%
$1.41↑#266461.30↑31.4 years↑
"If a land is tapped for mana, it produces colorless mana instead of any other type."
Infernal Darkness82%
$6.56↑#18855↑1.40↑31.4 years↑
"If a land is tapped for mana, it produces 
instead of any other type."
instead of any other type."
Contamination82%
$4.97↑#7946↑1.69↑28.0 years↑
"If a land is tapped for mana, it produces instead of any other type and amount."
instead of any other type and amount."
Alpine Moon78%
$0.30↓#245200.47↓8.3 years↓
"Lands your opponents control with the chosen name lose all land types and abilities, and they gain "
: Add one mana of any color.""
: Add one mana of any color.""
Damping Sphere77%
$0.64↑#4993↑1.36↑8.5 years↓
"If a land is tapped for two or more mana, it produces 
instead of any other type and amount."
instead of any other type and amount."
Harbinger of the Seas77%
$1.60↑#3933↑1.66↑2.3 years↓
"Nonbasic lands are Islands."
Blood Moon76%
$6.66↑#1553↑2.24↑32.2 years↑
"Nonbasic lands are Mountains."
Magus of the Moon76%
$3.50↑#3430↑1.93↑19.5 years↓
"Nonbasic lands are Mountains."
Skyshroud Elite74%
$0.14↓#276550.00↓28.3 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Pulse of Llanowar72%
$0.28↓#266060.29↓26.0 years
"If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type."
Zhao, the Moon Slayer71%
$0.28↓#10040↑1.10↑0.9 years↓
"Nonbasic lands enter tapped."