Prismatic Undercurrents
Vivid — When this enchantment enters, search your library for up to X basic land cards, where X is the number of colors among permanents you control. Reveal those cards, put them into your hand, then shuffle. You may play an additional land on each of your turns.
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Official rulings (4) · Scryfall
The colors are white, blue, black, red, and green. Colorless is not a color.
The effect of Prismatic Undercurrents's last ability is cumulative with similar effects. For example, if you control two Prismatic Undercurrents, you'll be able to play three lands during each of your turns.
The value of X is calculated only once, as Prismatic Undercurrents's first ability resolves.
Lands are normally colorless permanents, even if they tap for mana of a certain color.