Personally, I think HGSS, Triumphant, and Black/White are the most valuable packs
Based on my time with it so far, that could finally change with Disney Lorcana
Phantom Nishoba 2 Apparently this is a history lesson now
Such decisions require a lot of intricate thought and planning, and in a casual setting it's not as important, but at public events where prizes are on the line, you want to win, and avoid misplays and unwise decisions
For those that are a bit more limited in terms of budget, it will take extreme luck or quite a bit of time to grab the pricier cards
The artwork was drawn by Atsuko Nishida, the original designer of Pikachu herself