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The Waving Flag was obtainable in Season 22: "Visiting America" by reaching level 5.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
With a MU of ~84, this item just belongs in the very rare tier as its MU is comparable to the other spoilers in very rare. This spoiler should be in very rare because it ranges well within the other spoilers there and is very rarely seen in the market. Hazards spoiler is a very rare spoiler and has a very similar MU to this. Suggestion made by: @justice4zero