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So this means you can include Windswept Heath or Grasslands in your Green and Red decks because neither Windswept Heath or Grasslands have a white mana symbol on them

Outside of it, it's just a fun card to consider in the perfect build

Blastoise is quite popular too, which is another reason for the increased card price

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Thanks to our ramp spells (Paradise Druid and Growth Spiral), we can often get Narset on the battlefield on Turn 3, making it fast enough to help stabilize the board against creature decks, buying us the time we need to start casting Ultimatums to take over the game