Its also legendary because everythings legendary now
Players in the early beta discovered quickly that smaller sets, like Celebrations, had a lot more value, since you dont need to open as many packs to find lots of duplicates
Kura, the Boundless Sky The Green Dragon Spirit was the worst of its cycle the first time around, but this time it's the best
After all, its very much a sellers market since theres not much competition over these purely collectible cards
For non-foil cards, 1 in about 3 Draft Boosters will have a showcase or borderless card (any rarity excluding basic lands) with about 1 in 15 Draft Boosters having that card being a rare or mythic rare
The planeswalkers in this list are the ones that have proven their worth countless times