MARKET UPDATE: EX Delta Species (Top 15 Most Expensive Cards) The Delta Species era remains a highly sought after treasure in the secondary market.. Do you remember them? I wanna know which Delta species pokemon cards appreciation Here is an updated list. Majority of these cards are the same from the last time i posted this last year! I found these in my childhood pokemon collection and some are Pokmon TCG: Scarlet & Violet 10.5 Black Bolt Booster Bundle Wright Cards