Its a first edition print from a base set
I dont recommend trying to sell a large collection in person unless youve contacted the seller already
Like most Magic: The Gathering cards, the value of Marchesa, the Black Rose depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Conspiracy)
Fortunately, you don't need to understand the Laws of Time to understand paradox abilities, you just need to cast spells from unusual places
Including 32 holofoil rares and 40 non-holofoil rares, the set continued the concept of reverse holofoil cards introduced in the sets English predecessor, Legendary Collection, but with a more refined design
Look for suppliers offering officially licensed products (often indicated in descriptions, like Korean versions from Card Wangguk)