These cards are designed to strengthen previously released decks
It is one of the better reasons to pack an Etherium Sculptor too

Resources: How Versatile Acrylic Boxes Can Make an Event Acrylic Boxes: The Unsung Hero of Retail 6 Creative Ways Acrylic Boxes Can Make Your Display Standout Why Acrylic is the Best Material for Display Boxes Why Display Boxes Are Necessary for Collectibles Description Dimension Information Dimensions are EXTERIOR dimensions of the cover, not including the base, and have a tolerance of +/- 1/8 inch Height, Length and Width are available from 4 inches to 36 inches (contact us for other sizes) Boxes where the longest dimension is 9 inches or shorter are made from 1/8 inch thick clear acrylic Boxes where the longest dimension is 10 inches to 24 inches are made from 3/16 inch thick clear acrylic Boxes where the longest dimension is 25 inches or longer are made from 1/4 inch thick clear acrylic All bases are 1/4" thick acrylic plus a 1/8" tall step to hold the clear box cover in position Custom Order Lead Time These custom size display cases are made to order and typically ship in 6 business days Contact us if you need your order sooner and we will try our best to accommodate you (additional RUSH fees may apply) As with all custom acrylic display boxes, once an order is placed it cannot be cancelled, modified, or returned

In short, legendary Pokmon cards are valuable because theyre scarce, beautifully designed, feature some of the most powerful and iconic Pokmon in the series, and are thus coveted by collectors
Don't be afraid to experiment