Weaknesses : Weak to Fighting and Ground
A few things to look for in your stash are 1st Edition cards, Holographic cards, rare cards, popular Pokmon cards people are searching for, and the condition of the cards
Renegade Krasis from Dragons Maze introduced the term evolves that is defined as getting +1/+1 counters as Evolve trigger resolves
(Some later cards may appear, but not necessarily all.) Furthermore, all older cards (and even some particularly broken newer cards) will be updated and rebalanced to be more in line with the average power level of the XY era of the TCG
Creatures Your deck could revolve around a particular creature type such as goblins, dragons, or rogues
Lurrus fuels a lot of decks full of cheap cards: I dont really want to use counterspell on a Memnite, Thoughtseize or even Lightning Bolt