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a mono white flanking deck
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Why is Vivid Meadow in there? White is your only color, so a regular plains or a Kabira Crossroads would be better. The Meadow gives you nothing.
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There are several white knights from Mirage Block that would work well rather than just having vanilla flankers, Zhalfirin Crusader, Zhalfirin Commander, and Sidar Jibari would all work well. Kinsbale Cavalier, although lacks flanking, fits with the knight theme and would be a powerful finisher considering you dont have any removal other than prison term. Plus, lifegain doesn't win matches, it prolongs them, I would recommend getting some spot removal over having Heroes Remembered.