Assuming Jon rides Rhageal, the dragon named after his father, Viserion still needs a rider and I know there's ton of speculation on that. But what if the white (ice-like) dragon Viserion is just killed by Cersei's army and reanimated as a dragon for the Night's King? Viserys was a villain afterall. The only way I can see some sort of balance between a war with the Night's King and Daenerys' dragons is if they have a dragon themselves.
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