Quarum Trench Gnomes
Oracle Text
: If target Plains is tapped for mana, it produces colorless mana instead of white mana. (This effect lasts indefinitely.)
Card Rulings
8/1/2008 The ability only replaces white mana produced by the Plains. If a Plains somehow tries to produce mana of a different color (for instance, if you control a Joiner Adept), this effect will not cause it to produce colorless mana.
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