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{T}: Add {U}. If you played a land this turn, add {B} instead.
Abilities, attacks, weakness & resistance
Other cards from Doctor Who
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River of Tears (WHO 297, Rare) is a land from the Doctor Who expansion that can produce blue mana by default. If you played a land earlier that turn, tapping it produces black instead, giving a conditional color swap useful in two-color decks. Its timing interaction means it checks whether a land was played this turn, not whether a land was merely put onto the battlefield by other means.
Catalog pricing data as of 11 May 2026, 05:46