Pale Moon 
Instant
$0.46 #27758 0.75 26.6 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%
$1.45↑#263081.15↑31.3 years↑
"If a land is tapped for mana, it produces colorless mana instead of any other type."
Infernal Darkness82%
$6.73↑#18560↑1.29↑31.3 years↑
"If a land is tapped for mana, it produces 
instead of any other type."
instead of any other type."
Contamination82%
$4.94↑#7916↑1.50↑27.9 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%
$0.25↓#243770.43↓8.1 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.""
Harbinger of the Seas77%
$1.56↑#3774↑1.41↑2.2 years↓
"Nonbasic lands are Islands."
Damping Sphere76%
$0.67↑#4998↑1.12↑8.4 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."
Magus of the Moon76%
$3.97↑#3285↑1.75↑19.3 years↓
"Nonbasic lands are Mountains."
Blood Moon76%
$7.32↑#1485↑2.13↑32.1 years↑
"Nonbasic lands are Mountains."
Skyshroud Elite74%
$0.15↓#272570.06↓28.2 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Pulse of Llanowar72%
$0.28↓#263670.37↓25.9 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%
$0.32↓#10209↑0.00↓0.8 years↓
"Nonbasic lands enter tapped."