Ritual of Subdual {4}{G}{G}
Enchantment
Cumulative upkeep {2} (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 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.
Pulse of Llanowar 89%
$0.26#26212
"If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type."
Gauntlet of Power 82%
$4.26#2501
"Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color."