River of Tears
Land
{T}: Add {U}. If you played a land this turn, add {B} instead.
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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.
Riverpyre Verge 97%
$19.24#944
"{T}: Add {U}. Activate only if you control an Island or a Mountain."
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time 97%
$3.72#3047
"{T}: Add {U}. Remove a time counter from this land."