The major release standouts of this period were the Burning Shadows Charizard GX (2017), and Tag Team card Reshiram & Charizard GX from the Unbroken Bonds set (2019), two very playable cards that quickly found their way into the meta game
Forget aiming at collectible cards, to be competitive, maximising EXs is the priority
Double Pack Set Vol.10, releasing alongside OP15-EB04
Finally, don't be afraid to connect with other collectors and participate in trading events
What attacks does Blastoise ex have
monsters constantly activate their effects by leveling up, It's easy to be the target of hand trigger monsters, but this guy doesn't move at all whether it's a rabbit or a veiler, but PSY Frame doesn't move like this, so it's a good place