If you want to swap in something like Throne of Eldraine, it doesnt really matter
For example, Choco-Comment costs X and two red mana, so if you pay two for X, its mana value is considered four
The value of 1999 Pokmon cards will range from a few bucks for a poor-condition card to thousands for mint-condition pieces
Each Play Booster includes between one and four cards of Rare or higher rarity, plus a mix of Uncommons, Commons, and a Land card
Here are a list of sets we'd consider "Vintage" today: 1999-2000 Base Set Jungle Set Fossil Set Team Rocket Set Base Set 2 Gym Heroes Gym Challenge 2000-2002 Neo Genesis Neo Discovery Neo Revelation Neo Destiny 2002-2004 Expedition Base Set Aquapolis Skyridge There are also lots of promo Pokemon cards released during this era that are also considered vintage and rare
Theres also a feature called Wonder Pick, which will allow you to peruse opened packs by other players and try your luck at snagging a copy of one of their earned cards