These upgrades provide more tokens, more mana, more value, and more consistency
For individual cards and older booster packs and boxes, you will just have to gain a lot of experience and learn the nuances of real Pokemon products and then make educated purchases, ideally with a means of recourse if it turns out you were scammed (some kind of buyer protection program, etc)
Das Aktive Pokmon deines Gegners ist jetzt verwirrt
A sequel, Pokmon Trading Card Game 2: The Invasion of Team GR
For those unfamiliar, the term aggro is short for aggressive, and in this case, refers to a strategy that seeks to put lots of low-cost cards into play and gain enough of an advantage to win before the opponent can stabilize