That player may change any number of the targets, including all of them or none of them
Three countries manufactured English booster packs, just like the booster boxes, they are the USA, UK, and Australia
Cards like Second Harvest and Akroma's Will can be considered win more cards (aka cards that are basically only good when youre already winning or quite ahead of your opponents) so they can easily be taken out for something that can give a more consistent and long-term advantage
You can find lightly played (LP), moderately played (MP), and heavily played (HP) copies for a few dollars cheaper, but it's not worth the discount if you enjoy cards in great condition
If you want to check out my upgrade guides, you can find them here
Graded Population Report: Roronoa Zoro & Sanji ST12-001 Visualize the distrbution of grades in the chart