Royal Decree is a Ultra Rare Yu-Gi-Oh! card from the Tournament Pack 4 set (card #TP4-001). Its current market price is $375.78.
As of the latest update, Royal Decree carries a market value of about $375.78. Depending on condition and printing, recent prices range from around $129.75 (Damaged) up to $375.78 for a Near Mint copy. Over the past week the price has held steady, and it has been relatively flat over the last month.
A few things drive what Royal Decree sells for:
Royal Decree has been holding a steady price, making it easier to gauge a fair deal whether you're buying or selling. Either way, a local card shop can give you an in-hand assessment, and our buying & selling guide covers how to get a fair price.