A good competitive player constantly assesses their opponents board, their own hand, and the potential cards remaining in their deck to plan several turns ahead, always working towards their win condition while disrupting the opponents
Personally, getting so many new legendary assassins at the same time, mostly with similar mechanics, did make all the cards blur together a little
When you don't, you find yourself solving mini-problems that don't actually tie into your mega-problem
However, not all Pokemon cards are valuable, so its important to do your research before trying to sell them
Featuring several generations of the iconic series and over 150 duels from the show, there's plenty of content to keep you occupied