Ritual of Subdual 


Enchantment
$1.45 #26308 1.15 31.3 years
Cumulative upkeep
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
If a land is tapped for mana, it produces colorless mana instead of any other type.
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Cards similar to Ritual of Subdual 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.
Infernal Darkness95%
$6.73↑#18560↑1.29↑31.3 years
"If a land is tapped for mana, it produces
instead of any other type."
+1 more matching line
Contamination94%
$4.94↑#7916↑1.50↑27.9 years↓
"If a land is tapped for mana, it produces
instead of any other type and amount."
Damping Sphere86%
$0.67↓#4998↑1.128.4 years↓
"If a land is tapped for two or more mana, it produces
instead of any other type and amount."
Pale Moon82%
$0.46↓#277580.75↓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."