Prismatic Undercurrents is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
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.
Complete guide
Prismatic Undercurrents is a versatile enchantment that rewards you for diversifying your board state with multiple colors. Not only does it provide immediate card advantage by tutoring basic lands, but it also ramps you by allowing for extra land plays every turn.
Harnessing the Vivid Trigger
When Prismatic Undercurrents enters the battlefield, its 'Vivid' ability triggers. You check the number of colors among permanents you currently control to determine the value of X. You then search your library for up to that many basic land cards, reveal them, and add them to your hand. Note that since lands are generally colorless, they do not contribute to the value of X unless an effect states otherwise.
Resolution and Timing
The value of X is calculated exactly once: at the moment the triggered ability resolves. If your permanents change colors or leave the battlefield while the ability is on the stack, it may result in a different X value than when you first cast the spell. After finding your lands, you must shuffle your library regardless of how many cards you chose to find.
Playing Extra Lands
While Prismatic Undercurrents is on the battlefield, you gain the ability to play an additional land during each of your turns. This effect is cumulative; if you control multiple cards with this effect, such as two copies of Prismatic Undercurrents, you can play three lands per turn (your normal one, plus two additional ones).
Common Pitfalls
A common mistake is assuming 'colorless' counts as a color for the Vivid trigger; it does not. Only white, blue, black, red, and green are colors in Magic: The Gathering. Additionally, remember that this card puts lands into your hand, not onto the battlefield, though its secondary ability helps you get those lands into play quickly.
Interaction examples
Garruk's UprisingIf you control Garruk's Uprising (a green permanent) when Prismatic Undercurrents (another green permanent) enters, you only control one color among permanents: green. X will be 1, allowing you to search for one basic land. Garruk's Uprising does not provide extra colors, but it demonstrates how permanents of the same color do not increase the X value.
Doubling SeasonWith both Prismatic Undercurrents and Doubling Season on the battlefield, you have two additional land play effects. This means you can play a total of three lands during each of your turns. Note that Doubling Season does not double the number of lands searched for by the Vivid trigger, as those are cards added to your hand, not tokens or counters.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Prismatic Undercurrents
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The value of X is calculated only once, as Prismatic Undercurrents's first ability resolves.
No other card is named in this ruling.
- #2· Wizards of the Coast
Lands are normally colorless permanents, even if they tap for mana of a certain color.
No other card is named in this ruling.
- #3· Wizards of the Coast
The colors are white, blue, black, red, and green. Colorless is not a color.
No other card is named in this ruling.
- #4· Wizards of the Coast
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.
No other card is named in this ruling.
Legal formats
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Meta decks with Prismatic Undercurrents
No archived Top 8 deck with this card yet.